Writing an MP4 Muxer for Fun and Profit

MP4 is the most popular media container, but for us at the OBS Project it has some limitations that made its use undesirable for the majority of our users due to the data loss potential. Safer alternatives such as MKV - our previous default - have their own downsides that have been plaguing our users for the past decade. So last year I set out to explore our options to build something better by creatively (ab)using the ISO-BMFF specification, resulting in what we now call "Hybrid MP4".

This talk is based on my blog post by the same name, with a few additions and a propsal for slightly cursed uses of the hybrid MP4 concept.