Adding API and internal export support for audio gaps in sequences.

PiperOrigin-RevId: 678235289

RELEASENOTES.md

@@ -49,6 +49,7 @@
         allow invoking events of subclass listeners
         ([1736](https://github.com/androidx/media/pull/1736)).
 *   Transformer:
+    *   Add export support for gaps in sequences of audio EditedMediaItems.
 *   Track Selection:
 *   Extractors:
     *   Fix preroll sample handling for non-keyframe media start positions when

libraries/test_data/src/test/assets/transformerdumps/composition/seq-gap_1000ms+seq-sample.wav.dump

@@ -0,0 +1,227 @@
+format audio:
+  averageBitrate = 131072
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 2
+  sampleRate = 44100
+  pcmEncoding = 2
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -2078200747
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1746076349
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1572855937
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 701978997
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1243111139
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1322796125
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 183250677
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1653767665
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1354849623
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -394780569
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1818125983
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -2040268451
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1205101453
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1680621511
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1417062205
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 391927517
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1602519453
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -889560817
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1844125309
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1254048247
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 862533775
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1056907509
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 614586437
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1422444303
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1521025139
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -645048879
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1964215627
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 794382801
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1742698007
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1820518143
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1778289323
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1268893547
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1838744749
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1671917515
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1340018589
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1917601633
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -265336963
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -784922721
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1193402155
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1103096997
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1473134533
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1817808281
+  size = 272
+  isKeyFrame = true
+released = true

libraries/test_data/src/test/assets/transformerdumps/composition/seq-gap_100ms-sample_rf64.wav+seq-sample.wav.dump

@@ -0,0 +1,227 @@
+format audio:
+  averageBitrate = 131072
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 2
+  sampleRate = 44100
+  pcmEncoding = 2
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -2078200747
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1746076349
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1572855937
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 701978997
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 459593640
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 177383240
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 565637567
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1269391254
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1473724630
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1365108398
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 15208603
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -149452152
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 568136563
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1569944195
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1581189639
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 344240733
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1247810281
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 723599439
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1844125309
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1254048247
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 862533775
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1056907509
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 614586437
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1422444303
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1521025139
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -645048879
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1964215627
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 794382801
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1742698007
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1820518143
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1778289323
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1268893547
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1838744749
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1671917515
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1340018589
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1917601633
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -265336963
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -784922721
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1193402155
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1103096997
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1473134533
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1817808281
+  size = 272
+  isKeyFrame = true
+released = true

libraries/test_data/src/test/assets/transformerdumps/composition/seq-sample.wav+seq-sample.wav_clipped100msTo400ms-gap_700ms.dump

@@ -0,0 +1,117 @@
+format audio:
+  averageBitrate = 131072
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 1
+  sampleRate = 44100
+  pcmEncoding = 2
+sample:
+  trackType = audio
+  dataHashCode = -477126770
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 779113371
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 45842530
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2001000243
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -187462316
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -309708822
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1030869338
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1134039798
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -2131288947
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1159697593
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -889164698
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1380568930
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1722863050
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1365744081
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -81471997
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -6915052
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1634845963
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1252305359
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2127515647
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2077308846
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1055925064
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1128351030
+  size = 2184
+  isKeyFrame = true
+released = true

libraries/test_data/src/test/assets/transformerdumps/gap/500ms.dump

@@ -0,0 +1,117 @@
+format audio:
+  averageBitrate = 131072
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 2
+  sampleRate = 44100
+  pcmEncoding = 2
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1728208641
+  size = 2184
+  isKeyFrame = true
+released = true

libraries/test_data/src/test/assets/transformerdumps/sequence/gap_200ms/gap_500ms/sample.wav.dump

@@ -0,0 +1,377 @@
+format audio:
+  averageBitrate = 131072
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 2
+  sampleRate = 44100
+  pcmEncoding = 2
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1549267417
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 189152495
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1814391561
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -422124093
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -155446957
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1488079801
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1669809701
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -894031225
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 40356789
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 971335451
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1732134737
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -446879687
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 868401927
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1206562483
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1400548769
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1068263999
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -2145054801
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1570577127
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 688645803
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -2108835899
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -722381595
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1250628323
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 244326497
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -698620401
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 271098305
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1004000469
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1556734443
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -903836437
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -177535827
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -595024459
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -2131779733
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1910157521
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 131901723
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 583017977
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 163786317
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 387678787
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -884773583
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1782565003
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -270552755
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -371096827
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1960606887
+  size = 872
+  isKeyFrame = true
+released = true

libraries/test_data/src/test/assets/transformerdumps/sequence/gap_500ms/sample.wav/gap_200ms/sample.wav.dump

@@ -0,0 +1,592 @@
+format audio:
+  averageBitrate = 131072
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 2
+  sampleRate = 44100
+  pcmEncoding = 2
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1039756463
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -2624455
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1221457977
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 668147831
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -912268579
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1066036765
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1280807051
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -331910423
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
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+  size = 4096
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+sample:
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+  size = 4096
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
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+  size = 4096
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+  size = 4096
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+  size = 4096
+  isKeyFrame = true
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+  size = 4096
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+  size = 4096
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
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+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  dataHashCode = 285979697
+  size = 4096
+  isKeyFrame = true
+sample:
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+  dataHashCode = 1504030063
+  size = 4096
+  isKeyFrame = true
+sample:
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+  dataHashCode = 1211281407
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2008077475
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1938059573
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1433346369
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1711471215
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1312724333
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -675636013
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -12375949
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -180443079
+  size = 1144
+  isKeyFrame = true
+released = true

libraries/test_data/src/test/assets/transformerdumps/sequence/sample.wav/gap_200ms/sample.wav/gap_500ms.dump

@@ -0,0 +1,302 @@
+format audio:
+  averageBitrate = 131072
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 1
+  sampleRate = 44100
+  pcmEncoding = 2
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -77784020
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1487579866
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -955640128
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1797926221
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1304162335
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 87515422
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1134039798
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -2131288947
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1159697593
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -889164698
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1380568930
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1722863050
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1365744081
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -81471997
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -6915052
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1634845963
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1252305359
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2127515647
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2077308846
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1055925064
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1326368952
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2080056822
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -716932048
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1439402914
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -793688784
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 34855870
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1205979058
+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
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+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 785152593
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1048551992
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 522695938
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 575615445
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 372293125
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -547323125
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 119556475
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1819928231
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -2147026131
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -293825684
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -742988832
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1521393535
+  size = 572
+  isKeyFrame = true
+released = true

libraries/test_data/src/test/assets/transformerdumps/sequence/sample.wav/gap_500ms/gap_200ms.dump

@@ -0,0 +1,192 @@
+format audio:
+  averageBitrate = 131072
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 1
+  sampleRate = 44100
+  pcmEncoding = 2
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -77784020
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1487579866
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -955640128
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1797926221
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1304162335
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 87515422
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1134039798
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -2131288947
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1159697593
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -889164698
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1380568930
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1722863050
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1365744081
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -81471997
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -6915052
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1634845963
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1252305359
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2127515647
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2077308846
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1055925064
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1806711606
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1999233
+  size = 2484
+  isKeyFrame = true
+released = true

libraries/test_data/src/test/assets/transformerdumps/sequence/sample.wav/gap_500ms/gap_200ms/sample.wav.dump

@@ -0,0 +1,302 @@
+format audio:
+  averageBitrate = 131072
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 1
+  sampleRate = 44100
+  pcmEncoding = 2
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -77784020
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1487579866
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -955640128
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1797926221
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1304162335
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 87515422
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1134039798
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -2131288947
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1159697593
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -889164698
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1380568930
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1722863050
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1365744081
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -81471997
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -6915052
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1634845963
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1252305359
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2127515647
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2077308846
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1055925064
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1806711606
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1742602241
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -635847032
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1881983178
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -728439441
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 515653227
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -391208104
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 166656461
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 330396328
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -116386074
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 569267689
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1316476459
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -223671612
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1465862447
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2040352837
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1371156112
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1657641665
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1745756564
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2067094482
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 2009678119
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -1673523012
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1191811455
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = -120295709
+  size = 4096
+  isKeyFrame = true
+sample:
+  trackType = audio
+  dataHashCode = 1474861853
+  size = 572
+  isKeyFrame = true
+released = true

libraries/transformer/src/androidTest/java/androidx/media3/transformer/TransformerAndroidTestRunner.java

@@ -327,6 +327,9 @@ public class TransformerAndroidTestRunner {
     }
     for (EditedMediaItemSequence sequence : composition.sequences) {
       for (EditedMediaItem editedMediaItem : sequence.editedMediaItems) {
+        if (editedMediaItem.isGap()) {
+          continue;
+        }
         Uri mediaItemUri = checkNotNull(editedMediaItem.mediaItem.localConfiguration).uri;
         String scheme = mediaItemUri.getScheme();
         if (scheme != null && (scheme.equals("http") || scheme.equals("https"))) {

libraries/transformer/src/androidTest/java/androidx/media3/transformer/TransformerEndToEndTest.java

@@ -1610,6 +1610,74 @@ public class TransformerEndToEndTest {
     assertThat(new File(result.filePath).length()).isGreaterThan(0);
   }
 
+  @Test
+  public void start_audioCompositionWithFirstSequenceOffsetGap_isCorrect() throws Exception {
+    assumeFormatsSupported(
+        context,
+        testId,
+        /* inputFormat= */ MP4_ASSET.videoFormat,
+        /* outputFormat= */ MP4_ASSET.videoFormat);
+    EditedMediaItem editedMediaItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(Uri.parse(MP4_ASSET.uri)))
+            .setRemoveVideo(true)
+            .build();
+    Composition composition =
+        new Composition.Builder(
+                new EditedMediaItemSequence.Builder()
+                    .addGap(100_000)
+                    .addItem(editedMediaItem)
+                    .build(),
+                new EditedMediaItemSequence.Builder(editedMediaItem).build())
+            .build();
+
+    ExportTestResult result =
+        new TransformerAndroidTestRunner.Builder(context, new Transformer.Builder(context).build())
+            .build()
+            .run(testId, composition);
+
+    assertThat(new File(result.filePath).length()).isGreaterThan(0);
+    assertThat(result.exportResult.processedInputs).hasSize(3);
+  }
+
+  @Test
+  public void start_audioVideoCompositionWithSecondSequenceIntervalGap_isCorrect()
+      throws Exception {
+    assumeFormatsSupported(
+        context,
+        testId,
+        /* inputFormat= */ MP4_ASSET.videoFormat,
+        /* outputFormat= */ MP4_ASSET.videoFormat);
+
+    EditedMediaItem videoItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(Uri.parse(MP4_ASSET.uri))).build();
+    EditedMediaItem editedMediaItem =
+        new EditedMediaItem.Builder(
+                new MediaItem.Builder()
+                    .setUri(MP4_ASSET.uri)
+                    .setClippingConfiguration(
+                        new MediaItem.ClippingConfiguration.Builder().setEndPositionMs(300).build())
+                    .build())
+            .setRemoveVideo(true)
+            .build();
+    Composition composition =
+        new Composition.Builder(
+                new EditedMediaItemSequence.Builder(videoItem).build(),
+                new EditedMediaItemSequence.Builder()
+                    .addItem(editedMediaItem)
+                    .addGap(200_000)
+                    .addItem(editedMediaItem)
+                    .build())
+            .build();
+
+    ExportTestResult result =
+        new TransformerAndroidTestRunner.Builder(context, new Transformer.Builder(context).build())
+            .build()
+            .run(testId, composition);
+
+    assertThat(new File(result.filePath).length()).isGreaterThan(0);
+    assertThat(result.exportResult.processedInputs).hasSize(4);
+  }
+
   @Test
   public void analyzeAudio_completesSuccessfully() throws Exception {
     assumeFormatsSupported(

libraries/transformer/src/main/java/androidx/media3/transformer/Composition.java

@@ -440,4 +440,17 @@ public final class Composition {
     this.hdrMode = hdrMode;
     this.retainHdrFromUltraHdrImage = retainHdrFromUltraHdrImage;
   }
+
+  /**
+   * Return whether any {@linkplain EditedMediaItemSequence sequences} contain a {@linkplain
+   * EditedMediaItemSequence.Builder#addGap(long) gap}.
+   */
+  /* package */ boolean hasGaps() {
+    for (int i = 0; i < sequences.size(); i++) {
+      if (sequences.get(i).hasGaps()) {
+        return true;
+      }
+    }
+    return false;
+  }
 }

libraries/transformer/src/main/java/androidx/media3/transformer/EditedMediaItem.java

@@ -29,10 +29,12 @@ import androidx.media3.common.util.Util;
 import androidx.media3.exoplayer.source.MediaSource;
 import androidx.media3.extractor.mp4.Mp4Extractor;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
+import java.util.Objects;
 
 /** A {@link MediaItem} with the transformations to apply to it. */
 @UnstableApi
 public final class EditedMediaItem {
+  /* package */ static final String GAP_MEDIA_ID = "androidx-media3-GapMediaItem";
 
   /** A builder for {@link EditedMediaItem} instances. */
   public static final class Builder {
@@ -341,4 +343,12 @@ public final class EditedMediaItem {
     }
     return max(audioDurationUs, videoDurationUs);
   }
+
+  /**
+   * Returns whether this {@code EditedMediaItem} is a {@linkplain
+   * EditedMediaItemSequence.Builder#addGap(long) gap}.
+   */
+  /* package */ boolean isGap() {
+    return Objects.equals(mediaItem.mediaId, GAP_MEDIA_ID);
+  }
 }

libraries/transformer/src/main/java/androidx/media3/transformer/EditedMediaItemSequence.java

@@ -17,6 +17,7 @@ package androidx.media3.transformer;
 
 import static androidx.media3.common.util.Assertions.checkArgument;
 
+import androidx.media3.common.MediaItem;
 import androidx.media3.common.util.UnstableApi;
 import com.google.common.collect.ImmutableList;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
@@ -81,6 +82,26 @@ public final class EditedMediaItemSequence {
       return this;
     }
 
+    /**
+     * Adds a gap to the sequence.
+     *
+     * <p>A gap is a period of time with no media.
+     *
+     * <p>Gaps are only supported in sequences of audio.
+     *
+     * @param durationUs The duration of the gap, in milliseconds.
+     * @return This builder, for convenience.
+     */
+    @CanIgnoreReturnValue
+    public Builder addGap(long durationUs) {
+      items.add(
+          new EditedMediaItem.Builder(
+                  new MediaItem.Builder().setMediaId(EditedMediaItem.GAP_MEDIA_ID).build())
+              .setDurationUs(durationUs)
+              .build());
+      return this;
+    }
+
     /**
      * See {@link EditedMediaItemSequence#isLooping}.
      *
@@ -157,4 +178,14 @@ public final class EditedMediaItemSequence {
         !editedMediaItems.isEmpty(), "The sequence must contain at least one EditedMediaItem.");
     this.isLooping = builder.isLooping;
   }
+
+  /** Return whether any items are a {@linkplain Builder#addGap(long) gap}. */
+  /* package */ boolean hasGaps() {
+    for (int i = 0; i < editedMediaItems.size(); i++) {
+      if (editedMediaItems.get(i).isGap()) {
+        return true;
+      }
+    }
+    return false;
+  }
 }

libraries/transformer/src/main/java/androidx/media3/transformer/SequenceAssetLoader.java

@@ -64,7 +64,7 @@ import java.util.concurrent.atomic.AtomicInteger;
   private final List<EditedMediaItem> editedMediaItems;
   private final boolean isLooping;
   private final boolean forceAudioTrack;
-  private final AssetLoader.Factory assetLoaderFactory;
+  private final Factory assetLoaderFactory;
   private final CompositionSettings compositionSettings;
   private final Listener sequenceAssetLoaderListener;
   private final HandlerWrapper handler;
@@ -109,7 +109,7 @@ import java.util.concurrent.atomic.AtomicInteger;
   public SequenceAssetLoader(
       EditedMediaItemSequence sequence,
       boolean forceAudioTrack,
-      AssetLoader.Factory assetLoaderFactory,
+      Factory assetLoaderFactory,
       CompositionSettings compositionSettings,
       Listener listener,
       Clock clock,
@@ -117,7 +117,7 @@ import java.util.concurrent.atomic.AtomicInteger;
     editedMediaItems = sequence.editedMediaItems;
     isLooping = sequence.isLooping;
     this.forceAudioTrack = forceAudioTrack;
-    this.assetLoaderFactory = assetLoaderFactory;
+    this.assetLoaderFactory = new GapInterceptingAssetLoaderFactory(assetLoaderFactory);
     this.compositionSettings = compositionSettings;
     sequenceAssetLoaderListener = listener;
     handler = clock.createHandler(looper, /* callback= */ null);
@@ -131,7 +131,7 @@ import java.util.concurrent.atomic.AtomicInteger;
     // constructor.
     @SuppressWarnings("nullness:argument.type.incompatible")
     AssetLoader currentAssetLoader =
-        assetLoaderFactory.createAssetLoader(
+        this.assetLoaderFactory.createAssetLoader(
             editedMediaItems.get(0), looper, /* listener= */ this, compositionSettings);
     this.currentAssetLoader = currentAssetLoader;
   }
@@ -340,12 +340,14 @@ import java.util.concurrent.atomic.AtomicInteger;
       return;
     }
 
+    EditedMediaItem editedMediaItem = editedMediaItems.get(currentMediaItemIndex);
+
     onMediaItemChangedListener.onMediaItemChanged(
-        editedMediaItems.get(currentMediaItemIndex),
+        editedMediaItem,
         /* durationUs= */ (trackType == C.TRACK_TYPE_AUDIO && isLooping && decodeAudio)
             ? C.TIME_UNSET
             : currentAssetDurationUs,
-        /* decodedFormat= */ outputFormat,
+        /* decodedFormat= */ editedMediaItem.isGap() ? null : outputFormat,
         /* isLast= */ currentMediaItemIndex == editedMediaItems.size() - 1);
   }
 
@@ -544,6 +546,13 @@ import java.util.concurrent.atomic.AtomicInteger;
       }
     }
 
+    private void onGapSignalled() {
+      nonEndedTrackCount.decrementAndGet();
+      if (currentMediaItemIndex < editedMediaItems.size() - 1) {
+        switchAssetLoader();
+      }
+    }
+
     private void switchAssetLoader() {
       handler.post(
           () -> {
@@ -611,4 +620,106 @@ import java.util.concurrent.atomic.AtomicInteger;
       return new ClippingIterator(iterator.copyOf(), clippingValue);
     }
   }
+
+  /**
+   * Internally signals that the current asset is a {@linkplain
+   * EditedMediaItemSequence.Builder#addGap(long) gap}, but does no loading or processing of media.
+   *
+   * <p>This component requires downstream components to handle generation of the gap media.
+   */
+  private final class GapSignalingAssetLoader implements AssetLoader {
+
+    private static final int OUTPUT_FORMAT_RETRY_DELAY_MS = 10;
+
+    private final long durationUs;
+    private final Format trackFormat;
+    private final Format decodedFormat;
+
+    private boolean outputtedFormat;
+
+    private GapSignalingAssetLoader(long durationUs) {
+      this.durationUs = durationUs;
+      this.trackFormat = new Format.Builder().setSampleMimeType(MimeTypes.AUDIO_RAW).build();
+      this.decodedFormat =
+          new Format.Builder()
+              .setSampleMimeType(MimeTypes.AUDIO_RAW)
+              .setSampleRate(44100)
+              .setChannelCount(2)
+              .setPcmEncoding(C.ENCODING_PCM_16BIT)
+              .build();
+    }
+
+    @Override
+    public void start() {
+      onDurationUs(durationUs);
+      onTrackCount(1);
+      onTrackAdded(trackFormat, SUPPORTED_OUTPUT_TYPE_DECODED);
+      outputFormatToSequenceAssetLoader();
+    }
+
+    @Override
+    public @Transformer.ProgressState int getProgress(ProgressHolder progressHolder) {
+      progressHolder.progress = outputtedFormat ? 99 : 0;
+      return PROGRESS_STATE_AVAILABLE;
+    }
+
+    @Override
+    public ImmutableMap<Integer, String> getDecoderNames() {
+      return ImmutableMap.of();
+    }
+
+    @Override
+    public void release() {}
+
+    /** Outputs the gap format, scheduling to try again if unsuccessful. */
+    private void outputFormatToSequenceAssetLoader() {
+      try {
+        if (outputtedFormat) {
+          return;
+        }
+
+        @Nullable SampleConsumerWrapper sampleConsumerWrapper = onOutputFormat(decodedFormat);
+        if (sampleConsumerWrapper != null) {
+          outputtedFormat = true;
+          sampleConsumerWrapper.onGapSignalled();
+        } else {
+          handler.postDelayed(
+              this::outputFormatToSequenceAssetLoader, OUTPUT_FORMAT_RETRY_DELAY_MS);
+        }
+
+      } catch (ExportException e) {
+        onError(e);
+      } catch (RuntimeException e) {
+        onError(ExportException.createForAssetLoader(e, ExportException.ERROR_CODE_UNSPECIFIED));
+      }
+    }
+  }
+
+  /**
+   * Intercepts {@link AssetLoader.Factory} calls, when {@linkplain
+   * EditedMediaItemSequence.Builder#addGap(long) a gap} is detected, otherwise forwards them to the
+   * provided {@link AssetLoader.Factory}.
+   *
+   * <p>In the case that a gap is detected, a {@link GapSignalingAssetLoader} is returned.
+   */
+  private final class GapInterceptingAssetLoaderFactory implements AssetLoader.Factory {
+
+    private final AssetLoader.Factory factory;
+
+    public GapInterceptingAssetLoaderFactory(AssetLoader.Factory factory) {
+      this.factory = factory;
+    }
+
+    @Override
+    public AssetLoader createAssetLoader(
+        EditedMediaItem editedMediaItem,
+        Looper looper,
+        Listener listener,
+        CompositionSettings compositionSettings) {
+      if (editedMediaItem.isGap()) {
+        return new GapSignalingAssetLoader(editedMediaItem.durationUs);
+      }
+      return factory.createAssetLoader(editedMediaItem, looper, listener, compositionSettings);
+    }
+  }
 }

libraries/transformer/src/main/java/androidx/media3/transformer/TransformerUtil.java

@@ -83,6 +83,9 @@ public final class TransformerUtil {
         || composition.sequences.get(sequenceIndex).editedMediaItems.size() > 1) {
       return !composition.transmuxAudio;
     }
+    if (composition.hasGaps()) {
+      return true;
+    }
     if (encoderFactory.audioNeedsEncoding()) {
       return true;
     }

libraries/transformer/src/test/java/androidx/media3/transformer/CompositionExportTest.java

@@ -447,6 +447,278 @@ public class CompositionExportTest {
         getCompositionDumpFilePath("seq-sample.wav+seq-sample.wav_clipped_100ms_to_400ms"));
   }
 
+  @Test
+  public void start_audioCompositionWithFirstSequenceAsGap_isCorrect() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    EditedMediaItem audioItem1000ms =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW)).build();
+    Composition composition =
+        new Composition.Builder(
+                new EditedMediaItemSequence.Builder().addGap(1_000_000).build(),
+                new EditedMediaItemSequence.Builder(audioItem1000ms).build())
+            .build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    TransformerTestRunner.runLooper(transformer);
+
+    // Gaps are 44.1kHz, stereo by default. Sample.wav is 44.1kHz mono, so this test needs its own
+    // dump file.
+    DumpFileAsserts.assertOutput(
+        context,
+        muxerFactory.getCreatedMuxer(),
+        getCompositionDumpFilePath("seq-" + "gap_1000ms" + "+seq-" + getFileName(FILE_AUDIO_RAW)));
+  }
+
+  @Test
+  public void start_audioCompositionWithFirstSequenceOffsetGap_isCorrect() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    EditedMediaItem audioEditedMediaItem =
+        new EditedMediaItem.Builder(
+                MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW_STEREO_48000KHZ))
+            .build();
+    EditedMediaItem otherAudioEditedMediaItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW)).build();
+    Composition composition =
+        new Composition.Builder(
+                new EditedMediaItemSequence.Builder()
+                    .addGap(100_000)
+                    .addItem(audioEditedMediaItem)
+                    .build(),
+                new EditedMediaItemSequence.Builder(otherAudioEditedMediaItem).build())
+            .build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    ExportResult exportResult = TransformerTestRunner.runLooper(transformer);
+
+    assertThat(exportResult.processedInputs).hasSize(3);
+    DumpFileAsserts.assertOutput(
+        context,
+        muxerFactory.getCreatedMuxer(),
+        getCompositionDumpFilePath(
+            "seq-"
+                + "gap_100ms-"
+                + getFileName(FILE_AUDIO_RAW_STEREO_48000KHZ)
+                + "+seq-"
+                + getFileName(FILE_AUDIO_RAW)));
+  }
+
+  @Test
+  public void start_audioCompositionWithFirstSequencePaddingGap_isCorrect() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    EditedMediaItem audioItem300ms =
+        new EditedMediaItem.Builder(
+                MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW)
+                    .buildUpon()
+                    .setClippingConfiguration(
+                        new MediaItem.ClippingConfiguration.Builder()
+                            .setStartPositionMs(100)
+                            .setEndPositionMs(400)
+                            .build())
+                    .build())
+            .build();
+    EditedMediaItem audioItem1000ms =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW)).build();
+    Composition composition =
+        new Composition.Builder(
+                new EditedMediaItemSequence.Builder()
+                    .addItem(audioItem300ms)
+                    .addGap(700_000)
+                    .build(),
+                new EditedMediaItemSequence.Builder(audioItem1000ms).build())
+            .build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    TransformerTestRunner.runLooper(transformer);
+
+    DumpFileAsserts.assertOutput(
+        context,
+        muxerFactory.getCreatedMuxer(),
+        getCompositionDumpFilePath(
+            "seq-"
+                + getFileName(FILE_AUDIO_RAW)
+                + "+seq-"
+                + getFileName(FILE_AUDIO_RAW)
+                + "_clipped100msTo400ms-gap_700ms"));
+  }
+
+  @Test
+  public void start_audioVideoCompositionWithSecondSequenceOffsetGap_isCorrect() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    EditedMediaItem audioVideoEditedMediaItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW_VIDEO))
+            .build();
+    EditedMediaItem audioEditedMediaItem =
+        new EditedMediaItem.Builder(
+                MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW_STEREO_48000KHZ))
+            .setRemoveVideo(true)
+            .build();
+    Composition composition =
+        new Composition.Builder(
+                new EditedMediaItemSequence.Builder(audioVideoEditedMediaItem).build(),
+                new EditedMediaItemSequence.Builder()
+                    .addGap(200_000)
+                    .addItem(audioEditedMediaItem)
+                    .build())
+            .setTransmuxVideo(true)
+            .build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    ExportResult exportResult = TransformerTestRunner.runLooper(transformer);
+
+    assertThat(exportResult.processedInputs).hasSize(3);
+    DumpFileAsserts.assertOutput(
+        context,
+        muxerFactory.getCreatedMuxer(),
+        getCompositionDumpFilePath(
+            "seq-"
+                + getFileName(FILE_AUDIO_RAW_VIDEO)
+                + "+seq-gap_200ms-"
+                + getFileName(FILE_AUDIO_RAW_STEREO_48000KHZ)));
+  }
+
+  @Test
+  public void start_audioVideoCompositionWithSecondSequenceIntervalGap_isCorrect()
+      throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    EditedMediaItem audioVideoEditedMediaItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW_VIDEO))
+            .build();
+    EditedMediaItem audio300msEditedMediaItem =
+        new EditedMediaItem.Builder(
+                new MediaItem.Builder()
+                    .setUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW_STEREO_48000KHZ)
+                    .setClippingConfiguration(
+                        new MediaItem.ClippingConfiguration.Builder().setEndPositionMs(300).build())
+                    .build())
+            .setRemoveVideo(true)
+            .build();
+    EditedMediaItem audio500msEditedMediaItem =
+        new EditedMediaItem.Builder(
+                new MediaItem.Builder()
+                    .setUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW_STEREO_48000KHZ)
+                    .setClippingConfiguration(
+                        new MediaItem.ClippingConfiguration.Builder()
+                            .setStartPositionMs(300)
+                            .setEndPositionMs(800)
+                            .build())
+                    .build())
+            .setRemoveVideo(true)
+            .build();
+    Composition composition =
+        new Composition.Builder(
+                new EditedMediaItemSequence.Builder(audioVideoEditedMediaItem).build(),
+                new EditedMediaItemSequence.Builder()
+                    .addItem(audio300msEditedMediaItem)
+                    .addGap(200_000)
+                    .addItem(audio500msEditedMediaItem)
+                    .build())
+            .setTransmuxVideo(true)
+            .build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    ExportResult exportResult = TransformerTestRunner.runLooper(transformer);
+
+    assertThat(exportResult.processedInputs).hasSize(4);
+    DumpFileAsserts.assertOutput(
+        context,
+        muxerFactory.getCreatedMuxer(),
+        getCompositionDumpFilePath(
+            "seq-"
+                + getFileName(FILE_AUDIO_RAW_VIDEO)
+                + "+seq-"
+                + getFileName(FILE_AUDIO_RAW_STEREO_48000KHZ)
+                + "_clipped0msTo300ms-"
+                + "gap_200ms-"
+                + getFileName(FILE_AUDIO_RAW_STEREO_48000KHZ)
+                + "_clipped300msTo800ms"));
+  }
+
+  @Test
+  public void start_audioVideoCompositionWithSecondSequencePaddingGap_isCorrect() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    EditedMediaItem audioVideoEditedMediaItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW_VIDEO))
+            .build();
+    EditedMediaItem audioEditedMediaItem =
+        new EditedMediaItem.Builder(
+                MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW_STEREO_48000KHZ))
+            .setRemoveVideo(true)
+            .build();
+    Composition composition =
+        new Composition.Builder(
+                new EditedMediaItemSequence.Builder(audioVideoEditedMediaItem).build(),
+                new EditedMediaItemSequence.Builder()
+                    .addItem(audioEditedMediaItem)
+                    .addGap(100_000)
+                    .build())
+            .setTransmuxVideo(true)
+            .build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    ExportResult exportResult = TransformerTestRunner.runLooper(transformer);
+
+    assertThat(exportResult.processedInputs).hasSize(3);
+    DumpFileAsserts.assertOutput(
+        context,
+        muxerFactory.getCreatedMuxer(),
+        getCompositionDumpFilePath(
+            "seq-"
+                + getFileName(FILE_AUDIO_RAW_VIDEO)
+                + "+seq-"
+                + getFileName(FILE_AUDIO_RAW_STEREO_48000KHZ)
+                + "-gap_100ms"));
+  }
+
+  @Test
+  public void start_audioCompositionWithSecondSequenceAsGap_isCorrect() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    EditedMediaItem audioItem1000ms =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW)).build();
+    Composition composition =
+        new Composition.Builder(
+                new EditedMediaItemSequence.Builder(audioItem1000ms).build(),
+                new EditedMediaItemSequence.Builder().addGap(1_000_000).build())
+            .build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    TransformerTestRunner.runLooper(transformer);
+
+    DumpFileAsserts.assertOutput(
+        context, muxerFactory.getCreatedMuxer(), getDumpFileName(FILE_AUDIO_RAW));
+  }
+
+  @Test
+  public void start_audioCompositionWithBothSequencesAsGaps_isCorrect() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    Composition composition =
+        new Composition.Builder(
+                new EditedMediaItemSequence.Builder().addGap(500_000).build(),
+                new EditedMediaItemSequence.Builder().addGap(500_000).build())
+            .build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    TransformerTestRunner.runLooper(transformer);
+
+    DumpFileAsserts.assertOutput(
+        context, muxerFactory.getCreatedMuxer(), getDumpFileName("gap", "500ms"));
+  }
+
   private static String getFileName(String filePath) {
     int lastSeparator = filePath.lastIndexOf("/");
     return filePath.substring(lastSeparator + 1);

libraries/transformer/src/test/java/androidx/media3/transformer/MediaItemExportTest.java

@@ -141,6 +141,26 @@ public final class MediaItemExportTest {
     removeEncodersAndDecoders();
   }
 
+  @Test
+  public void start_gapOnlyExport_outputsSilence() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+
+    EditedMediaItemSequence gapSequence =
+        new EditedMediaItemSequence.Builder().addGap(500_000).build();
+
+    transformer.start(new Composition.Builder(gapSequence).build(), outputDir.newFile().getPath());
+    ExportResult result = TransformerTestRunner.runLooper(transformer);
+
+    // TODO(b/355201372) - Assert 500ms duration.
+    assertThat(result.durationMs).isAtLeast(487);
+    assertThat(result.durationMs).isAtMost(500);
+
+    DumpFileAsserts.assertOutput(
+        context, muxerFactory.getCreatedMuxer(), getDumpFileName("gap", "500ms"));
+  }
+
   @Test
   public void start_audioAndVideoPassthrough_withClippingStartAtKeyFrame_completesSuccessfully()
       throws Exception {

libraries/transformer/src/test/java/androidx/media3/transformer/SequenceExportTest.java

@@ -29,6 +29,7 @@ import static androidx.media3.transformer.TestUtil.createChannelCountChangingAud
 import static androidx.media3.transformer.TestUtil.createPitchChangingAudioProcessor;
 import static androidx.media3.transformer.TestUtil.createTransformerBuilder;
 import static androidx.media3.transformer.TestUtil.getDumpFileName;
+import static androidx.media3.transformer.TestUtil.getSequenceDumpFilePath;
 import static androidx.media3.transformer.TestUtil.removeEncodersAndDecoders;
 import static com.google.common.truth.Truth.assertThat;
 
@@ -498,6 +499,171 @@ public final class SequenceExportTest {
             "silenceHighPitch"));
   }
 
+  @Test
+  public void start_gapGap_completesSuccessfully() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    EditedMediaItemSequence sequence =
+        new EditedMediaItemSequence.Builder().addGap(300_000).addGap(200_000).build();
+    Composition composition = new Composition.Builder(sequence).build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    TransformerTestRunner.runLooper(transformer);
+
+    DumpFileAsserts.assertOutput(
+        context, muxerFactory.getCreatedMuxer(), getDumpFileName("gap", "500ms"));
+  }
+
+  @Test
+  public void start_itemGapGap_completesSuccessfully() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    EditedMediaItem firstAudioItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW)).build();
+    EditedMediaItemSequence sequence =
+        new EditedMediaItemSequence.Builder()
+            .addItem(firstAudioItem)
+            .addGap(500_000)
+            .addGap(200_000)
+            .build();
+    Composition composition = new Composition.Builder(sequence).build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    TransformerTestRunner.runLooper(transformer);
+
+    DumpFileAsserts.assertOutput(
+        context,
+        muxerFactory.getCreatedMuxer(),
+        getSequenceDumpFilePath(
+            ImmutableList.of(FILE_AUDIO_RAW.replace("wav/", ""), "gap_500ms", "gap_200ms")));
+  }
+
+  @Test
+  public void start_gapGapItem_completesSuccessfully() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    EditedMediaItem audioItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW)).build();
+    EditedMediaItemSequence sequence =
+        new EditedMediaItemSequence.Builder()
+            .addGap(200_000)
+            .addGap(500_000)
+            .addItem(audioItem)
+            .build();
+    Composition composition = new Composition.Builder(sequence).build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    TransformerTestRunner.runLooper(transformer);
+
+    DumpFileAsserts.assertOutput(
+        context,
+        muxerFactory.getCreatedMuxer(),
+        getSequenceDumpFilePath(
+            ImmutableList.of("gap_200ms", "gap_500ms", FILE_AUDIO_RAW.replace("wav/", ""))));
+  }
+
+  @Test
+  public void start_itemGapGapItem_completesSuccessfully() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    EditedMediaItem firstAudioItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW)).build();
+    EditedMediaItem secondAudioItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW)).build();
+
+    EditedMediaItemSequence sequence =
+        new EditedMediaItemSequence.Builder()
+            .addItem(firstAudioItem)
+            .addGap(500_000)
+            .addGap(200_000)
+            .addItem(secondAudioItem)
+            .build();
+    Composition composition = new Composition.Builder(sequence).build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    TransformerTestRunner.runLooper(transformer);
+
+    DumpFileAsserts.assertOutput(
+        context,
+        muxerFactory.getCreatedMuxer(),
+        getSequenceDumpFilePath(
+            ImmutableList.of(
+                FILE_AUDIO_RAW.replace("wav/", ""),
+                "gap_500ms",
+                "gap_200ms",
+                FILE_AUDIO_RAW.replace("wav/", ""))));
+  }
+
+  @Test
+  public void start_itemGapItemGap_completesSuccessfully() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    EditedMediaItem firstAudioItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW)).build();
+    EditedMediaItem secondAudioItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW)).build();
+
+    EditedMediaItemSequence sequence =
+        new EditedMediaItemSequence.Builder()
+            .addItem(firstAudioItem)
+            .addGap(200_000)
+            .addItem(secondAudioItem)
+            .addGap(500_000)
+            .build();
+    Composition composition = new Composition.Builder(sequence).build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    TransformerTestRunner.runLooper(transformer);
+
+    DumpFileAsserts.assertOutput(
+        context,
+        muxerFactory.getCreatedMuxer(),
+        getSequenceDumpFilePath(
+            ImmutableList.of(
+                FILE_AUDIO_RAW.replace("wav/", ""),
+                "gap_200ms",
+                FILE_AUDIO_RAW.replace("wav/", ""),
+                "gap_500ms")));
+  }
+
+  @Test
+  public void start_gapItemGapItem_completesSuccessfully() throws Exception {
+    CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);
+    Transformer transformer =
+        createTransformerBuilder(muxerFactory, /* enableFallback= */ false).build();
+    EditedMediaItem firstAudioItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW)).build();
+    EditedMediaItem secondAudioItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW)).build();
+
+    EditedMediaItemSequence sequence =
+        new EditedMediaItemSequence.Builder()
+            .addGap(500_000)
+            .addItem(firstAudioItem)
+            .addGap(200_000)
+            .addItem(secondAudioItem)
+            .build();
+    Composition composition = new Composition.Builder(sequence).build();
+
+    transformer.start(composition, outputDir.newFile().getPath());
+    TransformerTestRunner.runLooper(transformer);
+
+    DumpFileAsserts.assertOutput(
+        context,
+        muxerFactory.getCreatedMuxer(),
+        getSequenceDumpFilePath(
+            ImmutableList.of(
+                "gap_500ms",
+                FILE_AUDIO_RAW.replace("wav/", ""),
+                "gap_200ms",
+                FILE_AUDIO_RAW.replace("wav/", ""))));
+  }
+
   @Test
   public void concatenateTwoAudioItems_withSameFormat_completesSuccessfully() throws Exception {
     CapturingMuxer.Factory muxerFactory = new CapturingMuxer.Factory(/* handleAudioAsPcm= */ true);