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This is based on a spec at https://aomediacodec.github.io/id3-emsg/, further based on ISO/IEC 23009-1:2019. Within libavformat, timed ID3 metadata (already supported by the mpegts demuxer and muxer) is handled as a separate data AVStream with codec type AV_CODEC_ID_TIMED_ID3. However, it doesn't have a corresponding track in the mov file - instead, these events are written as separate toplevel 'emsg' boxes. Signed-off-by: Martin Storsjö <martin@martin.st>