This document defines registries for Codec IDs stored in the CodecID element.
A CodecID is a case-sensitive ASCII string with a V_, A_, S_ and B_ prefix for
video, audio, subtitle and button tracks respectively. The details of the string format
are found in (#codec-id).
To register a new Codec ID in this registry, one needs a Codec ID string, a TrackType value, a description, a Change Controller, and an optional Reference to a document describing the Codec ID.
Some Codec IDs values are deprecated and SHOULD NOT be used. Such Codec IDs are marked as "Reclaimed" in the "Matroska Codec IDs" registry.
(#codec-id-registry-table) shows the initial contents of the "Matroska Codec IDs" registry. The Change Controller for the initial entries is the IETF.
| Codec ID | Track Type | Description | Reference |
|---|---|---|---|
| V_AV1 | 1 | Alliance for Open Media AV1 | This document, (#v-av1) |
| V_AVS2 | 1 | AVS2-P2/IEEE.1857.4 | This document, (#v-avs2) |
| V_AVS3 | 1 | AVS3-P2/IEEE.1857.10 | This document, (#v-avs3) |
| V_CAVS | 1 | AVS1-P2/IEEE.1857.3 | This document, (#v-cavs) |
| V_DIRAC | 1 | Dirac / VC-2 | This document, (#v-dirac) |
| V_FFV1 | 1 | FFV1 | This document, (#v-ffv1) |
| V_MJPEG | 1 | Motion JPEG | This document, (#v-mjpeg) |
| V_MPEGH/ISO/HEVC | 1 | HEVC/H.265 | This document, (#v-mpegh-iso-hevc) |
| V_MPEGI/ISO/VVC | 1 | VVC/H.266 | This document, (#v-mpegi-iso-vvc) |
| V_MPEG1 | 1 | MPEG 1 | This document, (#v-mpeg1) |
| V_MPEG2 | 1 | MPEG 2 | This document, (#v-mpeg2) |
| V_MPEG4/ISO/AVC | 1 | AVC/H.264 | This document, (#v-mpeg4-iso-avc) |
| V_MPEG4/ISO/AP | 1 | MPEG4 ISO advanced profile | This document, (#v-mpeg4-iso-ap) |
| V_MPEG4/ISO/ASP | 1 | MPEG4 ISO advanced simple profile | This document, (#v-mpeg4-iso-asp) |
| V_MPEG4/ISO/SP | 1 | MPEG4 ISO simple profile | This document, (#v-mpeg4-iso-sp) |
| V_MPEG4/MS/V3 | 1 | Microsoft MPEG4 V3 | This document, (#v-mpeg4-ms-v3) |
| V_MS/VFW/FOURCC | 1 | Microsoft Video Codec Manager | This document, (#v-ms-vfw-fourcc) |
| V_QUICKTIME | 1 | Video taken from QuickTime files | This document, (#v-quicktime) |
| V_PRORES | 1 | Apple ProRes | This document, (#v-prores) |
| V_REAL/RV10 | 1 | RealVideo 1.0 aka RealVideo 5 | This document, (#v-real-rv10) |
| V_REAL/RV20 | 1 | RealVideo G2 and RealVideo G2+SVT | This document, (#v-real-rv20) |
| V_REAL/RV30 | 1 | RealVideo 8 | This document, (#v-real-rv30) |
| V_REAL/RV40 | 1 | rv40 : RealVideo 9 | This document, (#v-real-rv40) |
| V_THEORA | 1 | Theora | This document, (#v-theora) |
| V_UNCOMPRESSED | 1 | Raw uncompressed video frames | This document, (#v-uncompressed) |
| V_VP8 | 1 | VP8 Codec format | This document, (#v-vp8) |
| V_VP9 | 1 | VP9 Codec format | This document, (#v-vp9) |
| A_AAC/MPEG2/LC | 2 | Low Complexity | This document, (#a-aac-mpeg2-lc) |
| A_AAC/MPEG2/LC/SBR | 2 | Low Complexity with Spectral Band Replication | This document, (#a-aac-mpeg2-lc-sbr) |
| A_AAC/MPEG2/MAIN | 2 | MPEG2 Main Profile | This document, (#a-aac-mpeg2-main) |
| A_AAC/MPEG2/SSR | 2 | Scalable Sampling Rate | This document, (#a-aac-mpeg2-ssr) |
| A_AAC/MPEG4/LC | 2 | Low Complexity | This document, (#a-aac-mpeg4-lc) |
| A_AAC/MPEG4/LC/SBR | 2 | Low Complexity with Spectral Band Replication | This document, (#a-aac-mpeg4-lc-sbr) |
| A_AAC/MPEG4/LTP | 2 | Long Term Prediction | This document, (#a-aac-mpeg4-ltp) |
| A_AAC/MPEG4/MAIN | 2 | MPEG4 Main Profile | This document, (#a-aac-mpeg4-main) |
| A_AAC/MPEG4/SSR | 2 | Scalable Sampling Rate | This document, (#a-aac-mpeg4-ssr) |
| A_AC3 | 2 | Dolby Digital / AC-3 | This document, (#a-ac3) |
| A_AC3/BSID9 | 2 | Dolby Digital / AC-3 | This document, (#a-ac3-bsid9) |
| A_AC3/BSID10 | 2 | Dolby Digital / AC-3 | This document, (#a-ac3-bsid10) |
| A_ALAC | 2 | ALAC (Apple Lossless Audio Codec) | This document, (#a-alac) |
| A_ATRAC/AT1 | 2 | Sony ATRAC1 Codec | This document, (#a-atrac-at1) |
| A_DTS | 2 | Digital Theatre System | This document, (#a-dts) |
| A_DTS/EXPRESS | 2 | Digital Theatre System Express | This document, (#a-dts-express) |
| A_DTS/LOSSLESS | 2 | Digital Theatre System Lossless | This document, (#a-dts-lossless) |
| A_EAC3 | 2 | Dolby Digital Plus / E-AC-3 | This document, (#a-eac3) |
| A_FLAC | 2 | FLAC | This document, (#a-flac) |
| A_MLP | 2 | Meridian Lossless Packing / MLP | This document, (#a-mlp) |
| A_MPC | 2 | MPC (musepack) SV8 | This document, (#a-mpc) |
| A_MPEG/L1 | 2 | MPEG Audio 1, 2 Layer I | This document, (#a-mpeg-l1) |
| A_MPEG/L2 | 2 | MPEG Audio 1, 2 Layer II | This document, (#a-mpeg-l2) |
| A_MPEG/L3 | 2 | MPEG Audio 1, 2, 2.5 Layer III | This document, (#a-mpeg-l3) |
| A_MS/ACM | 2 | Microsoft Audio Codec Manager (ACM) | This document, (#a-ms-acm) |
| A_REAL/14_4 | 2 | Real Audio 1 | This document, (#a-real-14-4) |
| A_REAL/28_8 | 2 | Real Audio 2 | This document, (#a-real-28-8) |
| A_REAL/ATRC | 2 | Sony Atrac3 Codec | This document, (#a-real-atrc) |
| A_REAL/COOK | 2 | Real Audio Cook Codec | This document, (#a-real-cook) |
| A_REAL/RALF | 2 | Real Audio Lossless Format | This document, (#a-real-ralf) |
| A_REAL/SIPR | 2 | Sipro Voice Codec | This document, (#a-real-sipr) |
| A_OPUS | 2 | Opus interactive speech and audio codec | This document, (#a-opus) |
| A_PCM/FLOAT/IEEE | 2 | Floating-Point, IEEE compatible | This document, (#a-pcm-float-ieee) |
| A_PCM/INT/BIG | 2 | PCM Integer Big Endian | This document, (#a-pcm-int-big) |
| A_PCM/INT/LIT | 2 | PCM Integer Little Endian | This document, (#a-pcm-int-lit) |
| A_QUICKTIME | 2 | Audio taken from QuickTime files | This document, (#a-quicktime) |
| A_QUICKTIME/QDMC | 2 | QDesign Music | This document, (#a-quicktime-qdmc) |
| A_QUICKTIME/QDM2 | 2 | QDesign Music v2 | This document, (#a-quicktime-qdm2) |
| A_TRUEHD | 2 | Dolby TrueHD | This document, (#a-truehd) |
| A_TTA1 | 2 | The True Audio | This document, (#a-tta1) |
| A_VORBIS | 2 | Vorbis | This document, (#a-vorbis) |
| A_WAVPACK4 | 2 | WavPack | This document, (#a-wavpack4) |
| S_ARIBSUB | 17 | ARIB STD-B24 subtitles | This document, (#s-aribsub) |
| S_DVBSUB | 17 | Digital Video Broadcasting subtitles | This document, (#s-dvbsub) |
| S_HDMV/PGS | 17 | HDMV presentation graphics subtitles | This document, (#s-hdmv-pgs) |
| S_HDMV/TEXTST | 17 | HDMV text subtitles | This document, (#s-hdmv-textst) |
| S_KATE | 17 | Karaoke And Text Encapsulation | This document, (#s-kate) |
| S_IMAGE/BMP | 17 | Bitmap | This document, (#s-image-bmp) |
| S_ASS | 17 | Advanced SubStation Alpha Format | Reclaimed, (#s-text-ass) |
| S_TEXT/ASS | 17 | Advanced SubStation Alpha Format | This document, (#s-text-ass) |
| S_TEXT/ASCII | 17 | ASCII Plain Text | This document, (#s-text-ascii) |
| S_TEXT/SSA | 17 | SubStation Alpha Format | This document, (#s-text-ssa) |
| S_TEXT/USF | 17 | Universal Subtitle Format | This document, (#s-text-usf) |
| S_TEXT/UTF8 | 17 | UTF-8 Plain Text | This document, (#s-text-utf8) |
| S_TEXT/WEBVTT | 17 | Web Video Text Tracks (WebVTT) | This document, (#s-text-webvtt) |
| S_SSA | 17 | SubStation Alpha Format | Reclaimed, (#s-text-ass) |
| S_VOBSUB | 17 | VobSub subtitles | This document, (#s-vobsub) |
| B_VOBBTN | 18 | VobBtn Buttons | This document, (#b-vobbtn) |
| Table: Initial Contents of "Matroska Codec IDs" Registry{#codec-id-registry-table} |
This document defines registries for BlockAdditional Type IDs stored in the BlockAddIDType element.
The values correspond to the unsigned integer BlockAddIDType value described in [@!RFC9559, section 5.1.4.1.17.3].
To register a new BlockAdditional Type ID in this registry, one needs a BlockAddIDType unsigned integer,
a BlockAddIDName string value, a Change Controller, and an optional Reference to a document describing the BlockAdditional Type ID.
(#blockadd-id-registry-table) shows the initial contents of the "Matroska BlockAdditional Type IDs" registry. The Change Controller for the initial entries is the IETF.
| BlockAddIDType | BlockAddIDName | Reference |
|---|---|---|
| 0 | Use BlockAddIDValue | This document, (#use-blockaddidvalue) |
| 1 | Opaque data | This document, (#opaque-data) |
| 4 | ITU T.35 metadata | This document, (#itu-t-35-metadata) |
| 121 | SMPTE ST 12-1 timecode | This document, (#smpte-st-12-1-timecode) |
| 0x64766343 | Dolby Vision configuration dvcC | This document, (#dvcc) |
| 0x61766345 | Dolby Vision enhancement-layer AVC configuration | This document, (#avce) |
| 0x64767643 | Dolby Vision configuration dvvC | This document, (#dvvc) |
| 0x64767743 | Dolby Vision configuration dvwC | This document, (#dvwc) |
| 0x68766345 | Dolby Vision enhancement-layer HEVC configuration | This document, (#hvce) |
| 0x6D766343 | MVC configuration | This document, (#mvcc) |
| Table: Initial Contents of "Matroska BlockAdditional Type IDs" Registry{#blockadd-id-registry-table} |