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While highly useful, this feature has a few limitations depending on your tools:
: Previously, users had to record in .mkv format (which is naturally crash-safe) and then "remux" it into .mp4 for compatibility with editors. fMP4 eliminates this extra step. 437.mp4
The most significant and interesting feature regarding modern MP4 usage is the introduction of , specifically within recording software like OBS Studio . While highly useful, this feature has a few
: Instead of requiring the file to be "finalized" at the end, fMP4 splits the video into smaller, independently decodable segments called "fragments". If a crash occurs, everything recorded up to that moment is preserved. : Instead of requiring the file to be
: It generally works best with standard codecs like H.264 or H.265; more specialized formats may still require standard MP4 containers for full compatibility. Writing an MP4 Muxer for Fun and Profit - OBS Studio
This newer variant solves the "corruption risk" by changing how data is stored: