Improve frame rate calculation by using media duration from mdhd box
- Added logic to parse media duration from the `mdhd` box for accurate frame rate calculation. - Fallbacks to track duration from `tkhd` when `mdhd` contains invalid or missing data. - Avoids incorrect frame rate calculations in MP4 files with an edit list (`elst`) box. - Adds frame rate calculations for partially fragmented MP4 files. - Verified accuracy with tools like `mediainfo` and `ffprobe`. Issue: androidx/media#1531 **Note**: The slight difference in frame rate values in dump files that aren’t MP4s with an edit list or fragmented MP4s isn’t due to differences in `tkhd` and `mdhd` duration values (which should be identical for non-edited or non-fragmented files). Rather, it’s because they are calculated using different timescales. The `mvhd` box defines a global movie timescale, which is used for the track's `tkhd` duration. Meanwhile, each track’s `mdhd` box defines its own timescale specific to its content type, which we now use for more accurate frame rate calculation. PiperOrigin-RevId: 676046744
This commit is contained in:
rohks
Copybara-Service
parent
8799bf4bfe
commit
ecb0024a0b
@ -40,6 +40,9 @@
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* Fix preroll sample handling for non-keyframe media start positions when
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processing edit lists in MP4 files
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([#1659](https://github.com/google/ExoPlayer/issues/1659)).
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* Improved frame rate calculation by using media duration from the `mdhd`
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box in `Mp4Extractor` and `FragmentedMp4Extractor`
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([#1531](https://github.com/androidx/media/issues/1531)).
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* DataSource:
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* Audio:
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* Video:
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@ -203,6 +203,7 @@ public class DefaultSsChunkSource implements SsChunkSource {
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streamElement.timescale,
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C.TIME_UNSET,
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manifest.durationUs,
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/* mediaDurationUs= */ manifest.durationUs,
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format,
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Track.TRANSFORMATION_NONE,
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trackEncryptionBoxes,
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@ -351,8 +351,7 @@ public final class BoxParser {
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checkNotNull(mdia.getContainerBoxOfType(Mp4Box.TYPE_minf))
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.getContainerBoxOfType(Mp4Box.TYPE_stbl));
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Pair<Long, String> mdhdData =
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parseMdhd(checkNotNull(mdia.getLeafBoxOfType(Mp4Box.TYPE_mdhd)).data);
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MdhdData mdhdData = parseMdhd(checkNotNull(mdia.getLeafBoxOfType(Mp4Box.TYPE_mdhd)).data);
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LeafBox stsd = stbl.getLeafBoxOfType(Mp4Box.TYPE_stsd);
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if (stsd == null) {
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throw ParserException.createForMalformedContainer(
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@ -363,7 +362,7 @@ public final class BoxParser {
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stsd.data,
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tkhdData.id,
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tkhdData.rotationDegrees,
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mdhdData.second,
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mdhdData.language,
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drmInitData,
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isQuickTime);
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@Nullable long[] editListDurations = null;
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@ -383,9 +382,10 @@ public final class BoxParser {
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: new Track(
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tkhdData.id,
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trackType,
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mdhdData.first,
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mdhdData.timescale,
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movieTimescale,
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durationUs,
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mdhdData.mediaDurationUs,
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stsdData.format,
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stsdData.requiredSampleTransformation,
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stsdData.trackEncryptionBoxes,
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@ -431,6 +431,12 @@ public final class BoxParser {
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/* durationUs= */ 0);
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}
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if (track.type == C.TRACK_TYPE_VIDEO && track.mediaDurationUs > 0) {
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float frameRate = sampleCount / (track.mediaDurationUs / 1000000f);
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Format format = track.format.buildUpon().setFrameRate(frameRate).build();
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track = track.copyWithFormat(format);
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}
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// Entries are byte offsets of chunks.
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boolean chunkOffsetsAreLongs = false;
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@Nullable LeafBox chunkOffsetsAtom = stblBox.getLeafBoxOfType(Mp4Box.TYPE_stco);
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@ -927,23 +933,30 @@ public final class BoxParser {
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* Parses an mdhd atom (defined in ISO/IEC 14496-12).
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*
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* @param mdhd The mdhd atom to decode.
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* @return A pair consisting of the media timescale defined as the number of time units that pass
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* in one second, and the language code.
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* @return An {@link MdhdData} object containing the parsed data.
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*/
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private static Pair<Long, String> parseMdhd(ParsableByteArray mdhd) {
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private static MdhdData parseMdhd(ParsableByteArray mdhd) {
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mdhd.setPosition(Mp4Box.HEADER_SIZE);
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int fullAtom = mdhd.readInt();
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int version = parseFullBoxVersion(fullAtom);
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mdhd.skipBytes(version == 0 ? 8 : 16);
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long timescale = mdhd.readUnsignedInt();
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mdhd.skipBytes(version == 0 ? 4 : 8);
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long mediaDuration = version == 0 ? mdhd.readUnsignedInt() : mdhd.readUnsignedLongToLong();
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long mediaDurationUs;
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if (mediaDuration == 0) {
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// 0 duration normally indicates that the file is fully fragmented (i.e. all of the media
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// samples are in fragments). Treat as unknown.
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mediaDurationUs = C.TIME_UNSET;
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} else {
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mediaDurationUs = Util.scaleLargeTimestamp(mediaDuration, C.MICROS_PER_SECOND, timescale);
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}
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int languageCode = mdhd.readUnsignedShort();
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String language =
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""
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+ (char) (((languageCode >> 10) & 0x1F) + 0x60)
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+ (char) (((languageCode >> 5) & 0x1F) + 0x60)
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+ (char) ((languageCode & 0x1F) + 0x60);
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return Pair.create(timescale, language);
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return new MdhdData(timescale, mediaDurationUs, language);
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}
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/**
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@ -2408,6 +2421,19 @@ public final class BoxParser {
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}
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}
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/** Data parsed from mdhd box. */
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private static final class MdhdData {
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private final long timescale;
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private final long mediaDurationUs;
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private final String language;
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public MdhdData(long timescale, long mediaDurationUs, String language) {
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this.timescale = timescale;
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this.mediaDurationUs = mediaDurationUs;
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this.language = language;
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}
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}
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/** Data parsed from vexu box. */
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/* package */ static final class VexuData {
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@Nullable private final EyesData eyesData;
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@ -738,7 +738,9 @@ public final class Mp4Extractor implements Extractor, SeekMap {
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roleFlags |=
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firstVideoTrackIndex == C.INDEX_UNSET ? C.ROLE_FLAG_MAIN : C.ROLE_FLAG_ALTERNATE;
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}
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if (trackDurationUs > 0 && trackSampleTable.sampleCount > 0) {
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if (track.format.frameRate == Format.NO_VALUE
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&& trackDurationUs > 0
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&& trackSampleTable.sampleCount > 0) {
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float frameRate = trackSampleTable.sampleCount / (trackDurationUs / 1000000f);
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formatBuilder.setFrameRate(frameRate);
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}
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@ -64,6 +64,9 @@ public final class Track {
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/** The duration of the track in microseconds, or {@link C#TIME_UNSET} if unknown. */
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public final long durationUs;
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/** The duration of the media in microseconds, or {@link C#TIME_UNSET} if unknown. */
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public final long mediaDurationUs;
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/** The format. */
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public final Format format;
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@ -93,6 +96,7 @@ public final class Track {
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long timescale,
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long movieTimescale,
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long durationUs,
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long mediaDurationUs,
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Format format,
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@Transformation int sampleTransformation,
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@Nullable TrackEncryptionBox[] sampleDescriptionEncryptionBoxes,
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@ -104,6 +108,7 @@ public final class Track {
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this.timescale = timescale;
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this.movieTimescale = movieTimescale;
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this.durationUs = durationUs;
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this.mediaDurationUs = mediaDurationUs;
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this.format = format;
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this.sampleTransformation = sampleTransformation;
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this.sampleDescriptionEncryptionBoxes = sampleDescriptionEncryptionBoxes;
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@ -133,6 +138,7 @@ public final class Track {
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timescale,
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movieTimescale,
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durationUs,
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mediaDurationUs,
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format,
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sampleTransformation,
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sampleDescriptionEncryptionBoxes,
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@ -148,6 +154,7 @@ public final class Track {
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timescale,
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movieTimescale,
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durationUs,
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mediaDurationUs,
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format,
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sampleTransformation,
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sampleDescriptionEncryptionBoxes,
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@ -45,6 +45,7 @@ public class FragmentedMp4ExtractorNoSniffingTest {
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/* timescale= */ 30_000,
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/* movieTimescale= */ 1000,
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/* durationUs= */ C.TIME_UNSET,
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/* mediaDurationUs= */ C.TIME_UNSET,
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new Format.Builder().setSampleMimeType(MimeTypes.VIDEO_H264).build(),
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/* sampleTransformation= */ Track.TRANSFORMATION_NONE,
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/* sampleDescriptionEncryptionBoxes= */ null,
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 0
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width = 1280
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height = 720
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frameRate = 13.31
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frameRate = 13.32
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colorInfo:
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colorSpace = 2
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colorRange = 1
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 0
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width = 1280
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height = 720
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frameRate = 13.31
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frameRate = 13.32
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colorInfo:
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colorSpace = 2
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colorRange = 1
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 0
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width = 1280
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height = 720
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frameRate = 13.31
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frameRate = 13.32
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colorInfo:
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colorSpace = 2
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colorRange = 1
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 0
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width = 1280
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height = 720
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frameRate = 13.31
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frameRate = 13.32
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colorInfo:
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colorSpace = 2
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colorRange = 1
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 0
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width = 1280
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height = 720
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frameRate = 13.31
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frameRate = 13.32
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colorInfo:
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colorSpace = 2
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colorRange = 1
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 0
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width = 1280
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height = 720
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frameRate = 13.31
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frameRate = 13.32
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colorInfo:
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colorSpace = 2
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colorRange = 1
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 0
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width = 1280
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height = 720
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frameRate = 13.31
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frameRate = 13.32
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colorInfo:
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colorSpace = 2
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colorRange = 1
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 0
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width = 1280
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height = 720
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frameRate = 13.31
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frameRate = 13.32
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colorInfo:
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colorSpace = 2
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colorRange = 1
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 0
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width = 1280
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height = 720
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frameRate = 13.31
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frameRate = 13.32
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colorInfo:
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colorSpace = 2
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colorRange = 1
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 0
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width = 1280
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height = 720
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frameRate = 13.31
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frameRate = 13.32
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colorInfo:
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colorSpace = 2
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colorRange = 1
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 32.57
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frameRate = 28.03
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 32.57
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frameRate = 28.03
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 32.57
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frameRate = 28.03
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 32.57
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frameRate = 28.03
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 32.57
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frameRate = 28.03
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 32.57
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frameRate = 28.03
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 32.57
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frameRate = 28.03
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 32.57
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frameRate = 28.03
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 32.57
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frameRate = 28.03
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 32.57
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frameRate = 28.03
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -13,6 +13,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1080
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height = 720
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frameRate = 29.97
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colorInfo:
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lumaBitdepth = 8
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chromaBitdepth = 8
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@ -13,6 +13,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1080
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height = 720
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frameRate = 29.97
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colorInfo:
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lumaBitdepth = 8
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chromaBitdepth = 8
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@ -13,6 +13,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1080
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height = 720
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frameRate = 29.97
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colorInfo:
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lumaBitdepth = 8
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chromaBitdepth = 8
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@ -13,6 +13,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1080
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height = 720
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frameRate = 29.97
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colorInfo:
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lumaBitdepth = 8
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chromaBitdepth = 8
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 30.17
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frameRate = 30.00
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 30.17
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frameRate = 30.00
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 30.17
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frameRate = 30.00
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 30.17
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frameRate = 30.00
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 30.17
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frameRate = 30.00
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 30.17
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frameRate = 30.00
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 30.17
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frameRate = 30.00
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 30.17
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frameRate = 30.00
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rotationDegrees = 90
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colorInfo:
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colorSpace = 6
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@ -17,7 +17,7 @@ track 0:
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maxNumReorderSamples = 2
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width = 1920
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height = 1080
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frameRate = 30.17
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frameRate = 30.00
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rotationDegrees = 90
|
||||
colorInfo:
|
||||
colorSpace = 6
|
||||
|
||||
@ -17,7 +17,7 @@ track 0:
|
||||
maxNumReorderSamples = 2
|
||||
width = 1920
|
||||
height = 1080
|
||||
frameRate = 30.17
|
||||
frameRate = 30.00
|
||||
rotationDegrees = 90
|
||||
colorInfo:
|
||||
colorSpace = 6
|
||||
|
||||
@ -17,7 +17,7 @@ track 0:
|
||||
maxNumReorderSamples = 2
|
||||
width = 1920
|
||||
height = 1440
|
||||
frameRate = 29.18
|
||||
frameRate = 28.81
|
||||
rotationDegrees = 90
|
||||
colorInfo:
|
||||
colorRange = 1
|
||||
|
||||
@ -17,7 +17,7 @@ track 0:
|
||||
maxNumReorderSamples = 2
|
||||
width = 1920
|
||||
height = 1440
|
||||
frameRate = 29.18
|
||||
frameRate = 28.81
|
||||
rotationDegrees = 90
|
||||
colorInfo:
|
||||
colorRange = 1
|
||||
|
||||
@ -17,7 +17,7 @@ track 0:
|
||||
maxNumReorderSamples = 2
|
||||
width = 1920
|
||||
height = 1440
|
||||
frameRate = 29.18
|
||||
frameRate = 28.81
|
||||
rotationDegrees = 90
|
||||
colorInfo:
|
||||
colorRange = 1
|
||||
|
||||
@ -17,7 +17,7 @@ track 0:
|
||||
maxNumReorderSamples = 2
|
||||
width = 1920
|
||||
height = 1440
|
||||
frameRate = 29.18
|
||||
frameRate = 28.81
|
||||
rotationDegrees = 90
|
||||
colorInfo:
|
||||
colorRange = 1
|
||||
|
||||
@ -17,7 +17,7 @@ track 0:
|
||||
maxNumReorderSamples = 2
|
||||
width = 1920
|
||||
height = 1440
|
||||
frameRate = 29.18
|
||||
frameRate = 28.81
|
||||
rotationDegrees = 90
|
||||
colorInfo:
|
||||
colorRange = 1
|
||||
|
||||
@ -17,7 +17,7 @@ track 0:
|
||||
maxNumReorderSamples = 2
|
||||
width = 1920
|
||||
height = 1440
|
||||
frameRate = 29.18
|
||||
frameRate = 28.81
|
||||
rotationDegrees = 90
|
||||
colorInfo:
|
||||
colorRange = 1
|
||||
|
||||
@ -17,7 +17,7 @@ track 0:
|
||||
maxNumReorderSamples = 2
|
||||
width = 1920
|
||||
height = 1440
|
||||
frameRate = 29.18
|
||||
frameRate = 28.81
|
||||
rotationDegrees = 90
|
||||
colorInfo:
|
||||
colorRange = 1
|
||||
|
||||
@ -17,7 +17,7 @@ track 0:
|
||||
maxNumReorderSamples = 2
|
||||
width = 1920
|
||||
height = 1440
|
||||
frameRate = 29.18
|
||||
frameRate = 28.81
|
||||
rotationDegrees = 90
|
||||
colorInfo:
|
||||
colorRange = 1
|
||||
|
||||
@ -17,7 +17,7 @@ track 0:
|
||||
maxNumReorderSamples = 2
|
||||
width = 1920
|
||||
height = 1440
|
||||
frameRate = 29.18
|
||||
frameRate = 28.81
|
||||
rotationDegrees = 90
|
||||
colorInfo:
|
||||
colorRange = 1
|
||||
|
||||
@ -17,7 +17,7 @@ track 0:
|
||||
maxNumReorderSamples = 2
|
||||
width = 1920
|
||||
height = 1440
|
||||
frameRate = 29.18
|
||||
frameRate = 28.81
|
||||
rotationDegrees = 90
|
||||
colorInfo:
|
||||
colorRange = 1
|
||||
|
||||
@ -65,7 +65,7 @@ track 2:
|
||||
maxNumReorderSamples = 0
|
||||
width = 1920
|
||||
height = 1080
|
||||
frameRate = 30.00
|
||||
frameRate = 29.98
|
||||
colorInfo:
|
||||
colorSpace = 2
|
||||
colorRange = 1
|
||||
|
||||
@ -17,7 +17,7 @@ track 0:
|
||||
maxNumReorderSamples = 0
|
||||
width = 1920
|
||||
height = 1080
|
||||
frameRate = 30.00
|
||||
frameRate = 29.98
|
||||
rotationDegrees = 90
|
||||
colorInfo:
|
||||
colorSpace = 2
|
||||
|
||||
@ -6,7 +6,7 @@ format video:
|
||||
maxNumReorderSamples = 2
|
||||
width = 704
|
||||
height = 576
|
||||
frameRate = 1.04
|
||||
frameRate = 1.00
|
||||
colorInfo:
|
||||
lumaBitdepth = 8
|
||||
chromaBitdepth = 8
|
||||
|
||||
@ -6,7 +6,7 @@ format video:
|
||||
maxNumReorderSamples = 2
|
||||
width = 320
|
||||
height = 240
|
||||
frameRate = 29.52
|
||||
frameRate = 30.47
|
||||
colorInfo:
|
||||
lumaBitdepth = 8
|
||||
chromaBitdepth = 8
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user