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Matroska File Format with UYVY Video Encoding Matroska File Format with YUY2 Video Encoding Matroska File Format with V210 Video Encoding Matroska File Format with MPEG-2 Video Encoding (H.262) Matroska File Format with Advanced Audio Codec (AAC) Audio Encoding Matroska File Format with LPCM Audio Encoding Matroska File Format with MPEG-4, Advanced Video Coding (Part 10) (H.264) Matroska File Format with FFV1 video encoding Improved support for timecode, as opposed to timestamps, is still in development as is support for multi-planar and 3D videos.Ī final state format for enduser delivery. Subtitles and captions are well supported via a defined subtitle track and the specification recommends "For each subtitle track present, each subtitle frame SHOULD be referenced by a CuePoint Element with a CueDuration Element." The Attachments element is interesting in that it supports that attachment of pictures including cover art, webpages, programs, or even the codec needed to play back the file, much like the Generic Stream Partition functionality of a SMPTE RDD 48 MXF file (see 6.2.4.1 Generic Stream Partitions and Embedding Data on p. The payload data itself is stored as 'Blocks' (either SimpleBlocks or as a BlockGroup) in the Cluster Element.
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The extent of the required subelements depends on the codec used for the track but the subelements must provide all the data needed by the codec to decode the data of the specified track. Supported codecs and Codec ID details are available in the Codec Mappings. Technical details about the audio and video payloads are defined in the Tracks element such as CodecID, CodecName for any Track type with FieldOrder, StereoMode, DisplayWidth, DisplayHeight, AspectRatioType and color for video tracks and SamplingFrequency, Channels and BitDepth for audio tracks. Each of these contain a number of subelements to further define the content. It defines eight Top Level Elements which may occur within the Segment: SeekHead (also known as MetaSeek), Info, Tracks, Chapters, Cluster, Cues, Attachments, and Tags. The Matroska Specification includes several helpful diagrams to help visualize the structure. One interesting note is that the required EBML 'Root Element' in the EBML Schema is known as a 'Segment' in Matroska. See EBML for Matroska for more details about EBML. Specifically, within the EBML Header, EBML DocType must be EBMLSchema docType="matroska", EBMLMaxIDLength must be 4 and EBMLMaxSizeLength must be between 1 and 8 inclusive. Structurally, Matroska is built on the EBML framework with fixed declarations that define the file as a Matroska file. There MAY be further additions to v4."Īs a purpose built multimedia wrapper, Matroska has structures to carry a variety of payloads (as defined in the TrackType element) including video, audio, subtitles, metadata as well as other data types such as 'complex', logo, buttons, and control. Note that versions 1, 2 and 3 have been finalized.
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But since it's quite complete it is used as a reference for the development of libmatroska. The published IETF Internet Draft states in the Status of this document section: "This document is a work-in-progress specification defining the Matroska file format as part of the IETF Cellar working group.
MATROSKA CODEC UPDATE
As of 2020, Matroska is a Proposed Standard under active review with the most recent update on April 17, 2020. Since 2018, the in-process specification for version 4 of the Matroska Media Container Format has been published as a sequence of IETF Internet Drafts, available at Matroska Media Container Format Specifications datatracker. Matroska is a open, non-proprietary multimedia container format based on the EBML for Matroska structure.
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