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mkv-demuxer is a javascript library for demuxingmatroska, webm files in the browser. It can be used to:

• Get media information of a video
• Get all frames of a video
• Get a certain frame at a given timestamp of a video

npm install mkv-demuxer -S

importMkvDemuxerfrom'mkv-demuxer'constdemuxer=newMkvDemuxer()

Params:file, filePieceSize

• fileFile - The file to be parsed
• filePieceSizeNumber - The file piece size parsed each time

constfilePieceSize=1*1024*1024awaitdemuxer.initFile(file,filePieceSize)

Returns:Promise<meta>

• meta - The meta infomation of the file
  • info
    • durationNumber
    • titleString
    • ...
  • video
    • codecIDString
    • codecPrivateArrayBuffer
    • widthNumber
    • HeightNumber
    • displayWidthNumber
    • displayHeightNumber
    • languageString
    • ...
  • Audio
    • codecIDString
    • codecPrivateArrayBuffer
    • bitDepthNumber
    • channelsNumber
    • rateNumber
    • ...

constmeta=awaitdemuxer.getMeta()

To get all frames of a video.

Returns:Promise<data>

• data - The video data of the file
  • cuesArray - The keyframes of the file
    • cueTimeNumber
    • cueTrackPositions
      • cueClusterPositionNumber
      • cueRelativePositionNumber
      • cueTrackNumber
      • ...
    • ...
  • videoPacketsArray
    • startNumber
    • endNumber
    • sizeNumber
    • timestampNumber
    • isKeyframeBoolean
    • keyframeTimestampNumber
  • audioPacketsArray
    • startNumber
    • endNumber
    • sizeNumber
    • timestampNumber

constdata=awaitdemuxer.getData()

Params:timestamp

• timestampnumber

Returns:Promise<frame>

• frame
  • startNumber
  • endNumber
  • sizeNumber
  • timestampNumber
  • isKeyframeBoolean
  • keyframeTimestampNumber

constframe=awaitdemuxer.seekFrame(10)

To reset the demuxer.

importMkvDemuxerfrom'mkv-demuxer'constdemuxer=newMkvDemuxer()constfilePieceSize=1*1024*1024awaitdemuxer.initFile(file,filePieceSize)constmeta=awaitdemuxer.getMeta()constdata=awaitdemuxer.getData()constframe=awaitdemuxer.seekFrame(10)

This library is based onjswebm and has made a series of optimizations. It solves the memory problem, optimizes exception handling, and provides several useful APIs.