MKV tracks

Tracks (1654AE6B) has one TrackEntry for each track. Elements marked deprecated are listed as such in RFC 9559 Appendix A.

TrackEntry

ID	Element	Type	Meaning
`AE`	TrackEntry	Master	Describes one track.
`D7`	TrackNumber	Unsigned	Number used in Block headers.
`73C5`	TrackUID	Unsigned	Unique track ID.
`83`	TrackType	Unsigned	1 video, 2 audio, 3 complex, 16 logo, 17 subtitle, 18 buttons, 32 control, 33 metadata.
`B9`	FlagEnabled	Unsigned	1 if usable. Default 1.
`88`	FlagDefault	Unsigned	1 if eligible for automatic selection. Default 1.
`55AA`	FlagForced	Unsigned	Subtitles chosen automatically on a language match. Default 0.
`55AB`	FlagHearingImpaired	Unsigned	Suitable for hearing-impaired users.
`55AC`	FlagVisualImpaired	Unsigned	Suitable for visually impaired users.
`55AD`	FlagTextDescriptions	Unsigned	Contains text descriptions of the video.
`55AE`	FlagOriginal	Unsigned	In the content’s original language.
`55AF`	FlagCommentary	Unsigned	Contains commentary.
`9C`	FlagLacing	Unsigned	1 if Blocks may use lacing. Default 1.
`6DE7`	MinCache	Unsigned	Minimum frames to cache. Deprecated.
`6DF8`	MaxCache	Unsigned	Maximum cache for referenced frames. Deprecated.
`23E383`	DefaultDuration	Unsigned	Nanoseconds per frame.
`234E7A`	DefaultDecodedFieldDuration	Unsigned	Period between decoded fields, in nanoseconds.
`23314F`	TrackTimestampScale	Float	Speed scale relative to other tracks. Default 1.0. Up to version 3.
`537F`	TrackOffset	Signed	Offset added to Block times, in nanoseconds. Deprecated.
`55EE`	MaxBlockAdditionID	Unsigned	Largest BlockAddID; 0 means none.
`41E4`	BlockAdditionMapping	Master	Extends the track format with block or track data.
`41F0`	BlockAddIDValue	Unsigned	BlockAddID value described; at least 2.
`41A4`	BlockAddIDName	String	Friendly name of the mapping type.
`41E7`	BlockAddIDType	Unsigned	Registered mapping ID; 0 is codec-defined.
`41ED`	BlockAddIDExtraData	Binary	Extra data for interpreting BlockAdditional.
`536E`	Name	UTF-8	Friendly track name.
`22B59C`	Language	String	Language in Matroska form. Default `eng`.
`22B59D`	LanguageBCP47	String	Language per RFC 5646; overrides Language.
`86`	CodecID	String	The codec identifier.
`63A2`	CodecPrivate	Binary	Codec-private data.
`258688`	CodecName	UTF-8	Friendly codec name.
`7446`	AttachmentLink	Unsigned	FileUID of an attachment used by the codec. Up to version 3.
`3A9697`	CodecSettings	UTF-8	Description of encoding settings. Deprecated.
`3B4040`	CodecInfoURL	String	URL with codec information. Deprecated.
`26B240`	CodecDownloadURL	String	URL to download codec information. Deprecated.
`AA`	CodecDecodeAll	Unsigned	1 if the codec can decode damaged data. Deprecated.
`6FAB`	TrackOverlay	Unsigned	Overlay track for a given track. Deprecated.
`56AA`	CodecDelay	Unsigned	Built-in codec delay in nanoseconds.
`56BB`	SeekPreRoll	Unsigned	Data to decode after a seek before output is valid, in nanoseconds.
`6624`	TrackTranslate	Master	Maps the track to a chapter codec’s value.
`66A5`	TrackTranslateTrackID	Binary	The track’s value in the chapter codec’s data.
`66BF`	TrackTranslateCodec	Unsigned	Chapter codec the mapping applies to.
`66FC`	TrackTranslateEditionUID	Unsigned	Edition the track translation applies to.
`C0`	TrickTrackUID	Unsigned	TrackUID of a paired fast-forward track. Deprecated.
`C1`	TrickTrackSegmentUID	Binary	SegmentUUID containing the trick track. Deprecated.
`C6`	TrickTrackFlag	Unsigned	1 if this is a fast-forward track. Deprecated.
`C7`	TrickMasterTrackUID	Unsigned	TrackUID of the paired master track. Deprecated.
`C4`	TrickMasterTrackSegmentUID	Binary	SegmentUUID containing the master track. Deprecated.

Video

ID	Element	Type	Meaning
`E0`	Video	Master	Video settings.
`9A`	FlagInterlaced	Unsigned	0 undetermined, 1 interlaced, 2 progressive.
`9D`	FieldOrder	Unsigned	0 progressive, 1 top field first, 2 undetermined, 6 bottom field first, 9 top first interleaved, 14 bottom first interleaved.
`53B8`	StereoMode	Unsigned	See below.
`53C0`	AlphaMode	Unsigned	0 no alpha, 1 alpha in BlockAddID 1.
`53B9`	OldStereoMode	Unsigned	Deprecated bogus value; must not be used.
`B0`	PixelWidth	Unsigned	Encoded width.
`BA`	PixelHeight	Unsigned	Encoded height.
`54AA`	PixelCropBottom	Unsigned	Pixels removed from the bottom.
`54BB`	PixelCropTop	Unsigned	Pixels removed from the top.
`54CC`	PixelCropLeft	Unsigned	Pixels removed from the left.
`54DD`	PixelCropRight	Unsigned	Pixels removed from the right.
`54B0`	DisplayWidth	Unsigned	Display width after cropping.
`54BA`	DisplayHeight	Unsigned	Display height after cropping.
`54B2`	DisplayUnit	Unsigned	0 pixels, 1 centimetres, 2 inches, 3 display aspect ratio, 4 unknown.
`54B3`	AspectRatioType	Unsigned	0 free, 1 keep, 2 fixed. Deprecated.
`2EB524`	UncompressedFourCC	Binary	Pixel format FourCC, required for `V_UNCOMPRESSED`.
`2FB523`	GammaValue	Float	Gamma value. Deprecated.
`2383E3`	FrameRate	Float	Frames per second, informational. Deprecated.

StereoMode	Layout	StereoMode	Layout
0	Mono	8	Column interleaved, right first
1	Side by side, left first	9	Column interleaved, left first
2	Top-bottom, right first	10	Anaglyph cyan and red
3	Top-bottom, left first	11	Side by side, right first
4	Checkerboard, right first	12	Anaglyph green and magenta
5	Checkerboard, left first	13	Both eyes laced, left first
6	Row interleaved, right first	14	Both eyes laced, right first
7	Row interleaved, left first

Colour

ID	Element	Type	Meaning
`55B0`	Colour	Master	Colour format settings.
`55B1`	MatrixCoefficients	Unsigned	ITU-T H.273 matrix, 0 to 14. Default 2, unspecified.
`55B2`	BitsPerChannel	Unsigned	Decoded bits per channel; 0 is unspecified.
`55B3`	ChromaSubsamplingHorz	Unsigned	Chroma pixels removed horizontally.
`55B4`	ChromaSubsamplingVert	Unsigned	Chroma pixels removed vertically.
`55B5`	CbSubsamplingHorz	Unsigned	Additional Cb horizontal subsampling.
`55B6`	CbSubsamplingVert	Unsigned	Additional Cb vertical subsampling.
`55B7`	ChromaSitingHorz	Unsigned	0 unspecified, 1 left collocated, 2 half.
`55B8`	ChromaSitingVert	Unsigned	0 unspecified, 1 top collocated, 2 half.
`55B9`	Range	Unsigned	0 unspecified, 1 broadcast, 2 full, 3 defined by the matrix and transfer.
`55BA`	TransferCharacteristics	Unsigned	H.273 transfer, 0 to 18. Default 2.
`55BB`	Primaries	Unsigned	H.273 primaries, 0 to 12 and 22. Default 2.
`55BC`	MaxCLL	Unsigned	Maximum content light level, cd/m².
`55BD`	MaxFALL	Unsigned	Maximum frame-average light level, cd/m².
`55D0`	MasteringMetadata	Master	SMPTE 2086 mastering data.
`55D1`	PrimaryRChromaticityX	Float	Red X (CIE 1931).
`55D2`	PrimaryRChromaticityY	Float	Red Y.
`55D3`	PrimaryGChromaticityX	Float	Green X.
`55D4`	PrimaryGChromaticityY	Float	Green Y.
`55D5`	PrimaryBChromaticityX	Float	Blue X.
`55D6`	PrimaryBChromaticityY	Float	Blue Y.
`55D7`	WhitePointChromaticityX	Float	White X.
`55D8`	WhitePointChromaticityY	Float	White Y.
`55D9`	LuminanceMax	Float	Maximum mastering luminance, cd/m².
`55DA`	LuminanceMin	Float	Minimum mastering luminance, cd/m².
`7670`	Projection	Master	Projection details, for spherical and VR video.
`7671`	ProjectionType	Unsigned	0 rectangular, 1 equirectangular, 2 cubemap, 3 mesh.
`7672`	ProjectionPrivate	Binary	Projection-specific data.
`7673`	ProjectionPoseYaw	Float	Yaw in degrees, −180 to 180.
`7674`	ProjectionPosePitch	Float	Pitch in degrees, −90 to 90.
`7675`	ProjectionPoseRoll	Float	Roll in degrees, −180 to 180.

Audio

ID	Element	Type	Meaning
`E1`	Audio	Master	Audio settings.
`B5`	SamplingFrequency	Float	Sampling frequency in Hz. Default 8000.
`78B5`	OutputSamplingFrequency	Float	Output frequency, for SBR. Defaults to SamplingFrequency.
`9F`	Channels	Unsigned	Number of channels. Default 1.
`7D7B`	ChannelPositions	Binary	Horizontal angles per channel. Deprecated.
`6264`	BitDepth	Unsigned	Bits per sample.
`52F1`	Emphasis	Unsigned	0 none, 1 CD, 3 CCIT J.17, 4 FM 50, 5 FM 75, 10 RIAA, 11 IEC N78, 12 TELDEC, 13 EMI, 14 Columbia LP, 15 London, 16 NARTB. 2 is reserved.

Track operations

ID	Element	Type	Meaning
`E2`	TrackOperation	Master	Operations that build a virtual track.
`E3`	TrackCombinePlanes	Master	Video planes combined into a 3D track.
`E4`	TrackPlane	Master	One plane track.
`E5`	TrackPlaneUID	Unsigned	TrackUID of the plane.
`E6`	TrackPlaneType	Unsigned	0 left eye, 1 right eye, 2 background.
`E9`	TrackJoinBlocks	Master	Tracks whose Blocks join into a virtual track.
`ED`	TrackJoinUID	Unsigned	TrackUID whose Blocks are used.

Content encodings

ID	Element	Type	Meaning
`6D80`	ContentEncodings	Master	Compression and encryption settings.
`6240`	ContentEncoding	Master	One encoding.
`5031`	ContentEncodingOrder	Unsigned	Order of applying encodings; unique per track.
`5032`	ContentEncodingScope	Unsigned	Bit field: `1` Block, `2` Private, `4` Next.
`5033`	ContentEncodingType	Unsigned	0 compression, 1 encryption.
`5034`	ContentCompression	Master	Compression settings.
`4254`	ContentCompAlgo	Unsigned	0 zlib, 1 bzlib, 2 lzo1x, 3 header stripping.
`4255`	ContentCompSettings	Binary	Decompressor settings; the stripped bytes for header stripping.
`5035`	ContentEncryption	Master	Encryption settings.
`47E1`	ContentEncAlgo	Unsigned	0 none, 1 DES, 2 3DES, 3 Twofish, 4 Blowfish, 5 AES.
`47E2`	ContentEncKeyID	Binary	Public key ID used for encryption.
`47E7`	ContentEncAESSettings	Master	AES settings.
`47E8`	AESSettingsCipherMode	Unsigned	1 AES-CTR, 2 AES-CBC.
`47E3`	ContentSignature	Binary	Cryptographic signature. Deprecated.
`47E4`	ContentSigKeyID	Binary	ID of the signing private key. Deprecated.
`47E5`	ContentSigAlgo	Unsigned	0 not signed, 1 RSA. Deprecated.
`47E6`	ContentSigHashAlgo	Unsigned	0 not signed, 1 SHA1-160, 2 MD5. Deprecated.

.MKV File Format – Tracks

TrackEntry

Video

Colour

Audio

Track operations

Content encodings