mp4ff - beyond MP4 boxes

• mp4ff

  2 404 8.5 Go

  Library and tools for parsing and writing MP4 files including video, audio and subtitles. The focus is on fragmented files. Includes mp4ff-info, mp4ff-encrypt, mp4ff-decrypt and other tools.

  

Part 30 of the MPEG-4 standard describes how TTML and WebVTT subtitles shall be carried in MP4 files. The approaches are very different. For TTML, the original XML structure is used, and there is typically a single sample per segment. That sample is a complete TTML XML document with internal time stamps. Beyond text, it can also provide image subtitles and carry such images as subsamples. The codecs attribute for such a file is stpp, and there is an [stpp] box that should be included in the track sample descriptor. mp4ff supports all relevant boxes.

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