Matroska

• Extensions: mkv, mk3d, mka, mks, webm.
• Website: http://matroska.org
• Specification: https://matroska.org/technical/basics.html
• MIME Type:
  • mkv: video/mkv

Matroska is a free, general-purpose container format designed to supplant currently existing container formats like AVI. The shortcomings in the Matroska design sparked the development of NUT.

Codec IDs

An incomplete list of Matroska codec IDs can be found here: http://www.matroska.org/technical/specs/codecid/index.html
Haali media splitter has another list here: http://haali.cs.msu.ru/mkv/codecs.pdf

The following Codec IDs are known to be in use:

• V_DIRAC: Dirac [1]
• V_MS/VFW/FOURCC: VfW compatibility mode
• V_MPEG1: MPEG-1
• V_MPEG2: MPEG-2
• V_MPEG4/ISO/SP: MPEG-4 part 2 Simple Profile (divx4)
• V_MPEG4/ISO/ASP: MPEG-4 part 2 Advanced Simple Profile
• V_MPEG4/ISO/AP: MPEG-4 part 10 Advanced Profile (H.264)
• V_MPEG4/MS/V3: Divx3
• V_REAL/RV10: RealVideo 1
• V_REAL/RV20: RealVideo G2
• V_REAL/RV30: RealVideo 3
• V_REAL/RV40: RealVideo 4
• V_SNOW: FFmpeg Snow
• V_THEORA: Xiph Theora
• V_QUICKTIME: Quicktime compatiblity mode (mainly for SVQ3)
• V_UNCOMPRESSED: Uncompressed, format defined by KaxCodecColourSpace
• V_VC1: Deprecated; Use V_MS/VFW/FOURCC with WMV3 or WVC1 instead [2]
• V_VP8: VP8 [3]

• A_AAC: Advanced Audio Coding
• A_AAC/MPEGx/y: Obsolete; Use A_AAC instead
• A_AC3: ATSC A/52a
• A_EAC3: ATSC A/52b [4]
• A_DTS: DTS Coherent Acoustics
• A_FLAC: FLAC
• A_MPC: Musepack SV8
• A_MPEG/L1: MP1
• A_MPEG/L2: MP2
• A_MPEG/L3: MP3
• A_PCM/INT/BIG: Uncompressed PCM, Big-Endian
• A_PCM/INT/LIT: Uncompressed PCM, Little-Endian
• A_PCM/FLOAT/IEEE: Uncompressed PCM, IEEE floating-point
• A_REAL/14_4: VSELP
• A_REAL/28_8: RealAudio 28.8
• A_REAL/ATRC: ATRAC3, using Real extradata and xor format (RealAudio atrc)
• A_REAL/COOK: RealAudio cook
• A_REAL/SIPR: RealAudio sipr
• A_TTA1: True Audio lossless
• A_VORBIS: Vorbis
• A_WAVPACK4: WavPack
• A_QUICKTIME: Quicktime compatibility (uncommon)
• A_MS/ACM: Windows ACM compatibility (uncommon)

Proposed but not yet implemented

• A_SPEEX: Speex [5]