diff --git a/libraries/test_data/src/test/assets/muxerdumps/README.md b/libraries/test_data/src/test/assets/muxerdumps/README.md
new file mode 100644
index 0000000000..2a4495e540
--- /dev/null
+++ b/libraries/test_data/src/test/assets/muxerdumps/README.md
@@ -0,0 +1,7 @@
+# Muxer dump files
+
+To generate a new dump file or to update an existing one:
+
+1. Change `DumpFileAsserts#DUMP_FILE_ACTION` to `WRITE_TO_LOCAL` (for Robolectric tests) or `WRITE_TO_DEVICE` (for Instrumentation tests).
+2. Re-run the test.
+3. Change `DumpFileAsserts#DUMP_FILE_ACTION` back to `COMPARE_WITH_EXISTING`.
diff --git a/libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_av1.dump b/libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_av1.dump
new file mode 100644
index 0000000000..bc8cd9a540
--- /dev/null
+++ b/libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_av1.dump
@@ -0,0 +1 @@
+VideoSampleEntryBox = 0000007d61763031000000000000000100000000000000000000000000000000000a000c004800000048000000000000000100202020202020202020202020202020202020202020202020202020202020200018ffff0000001761763143812000000a09200000019cdbfff30400000010706173700001000000010000
diff --git a/libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_h264.dump b/libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_h264.dump
new file mode 100644
index 0000000000..3190c1278c
--- /dev/null
+++ b/libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_h264.dump
@@ -0,0 +1 @@
+VideoSampleEntryBox = 0000009661766331000000000000000100000000000000000000000000000000000a000c004800000048000000000000000100202020202020202020202020202020202020202020202020202020202020200018ffff000000306176634301f4000affe1001867f4000a919b2bf3cb3640000003004000000c83c489658001000568ebe3c44800000010706173700001000000010000
diff --git a/libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_h265.dump b/libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_h265.dump
new file mode 100644
index 0000000000..0d4dc2a369
--- /dev/null
+++ b/libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_h265.dump
@@ -0,0 +1 @@
+VideoSampleEntryBox = 000000d66876633100000000000000010000000000000000000000000000000000300020004800000048000000000000000100202020202020202020202020202020202020202020202020202020202020200018ffff00000070687663430104080000009fc8000000001ef000fcfcf8f800000f03200001001740010c01ffff0408000003009fc800000300001e95980921000100254201010408000003009fc800000300001ec1882165959ae4cae68080000003008000000c8422000100064401c173d08900000010706173700001000000010000
diff --git a/libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_h265_hdr10.dump b/libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_h265_hdr10.dump
new file mode 100644
index 0000000000..d501042085
--- /dev/null
+++ b/libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_h265_hdr10.dump
@@ -0,0 +1 @@
+VideoSampleEntryBox = 000000dd6876633100000000000000010000000000000000000000000000000001000100004800000048000000000000000100202020202020202020202020202020202020202020202020202020202020200018ffff00000077687663430102200000009000000000003cf000fcfdfafa00000f03200001001840010c01ffff02200000030090000003000003003c959809210001002a42010102200000030090000003000003003ca008080404d96566924cae69c2000003000200000300321022000100074401c172b4624000000010706173700001000000010000