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Writing an MP4 Muxer for Fun and Profit
(Except there is no profit, only pain) In OBS 30.2 I introduced the new
This allows for a hierarchical structure of the file and makes it easy to extend the format by introducing new boxes containing additional information without breaking backwards compatibility with existing software. There are two things here that create the main problem we have with MP4: The moov sits at the end and is written when finalising the file, and it is required to be able to make sense of the data contained in the mdat box. The process of building this implementation took me down quite a few rabbit holes, as it required me to learn a lot of low-level details about how audio and video data is stored in files, and sometimes left me wondering why my results were different from the references I was using.
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