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https://github.com/epiclabs-io/inspector.js | Typescript library that implements MpegTS, MP4 and WebM demuxers.
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https://github.com/videojs/thumbcoil | Tools for inspecting MPEG2TS, fMP4, and FLV files and the codec bitstreams therein
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https://github.com/madebyhiro/codem-isoboxer | A lightweight browser-based MPEG-4 (ISOBMFF) file/box parser
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https://github.com/gpac/mp4box.js | JavaScript version of GPAC's MP4Box tool
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https://github.com/kuu/Kontainer | A media file format generator/parser that exposes a React-like API.