437.mp4

: 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.

Traditionally, recording directly to a "standard" MP4 was extremely risky; if your computer crashed or lost power before the recording finished, the entire file would be corrupted and unrecoverable. Key Feature: Fragmented MP4 (fMP4) 437.mp4

: 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 : Instead of requiring the file to be

This newer variant solves the "corruption risk" by changing how data is stored: Key Feature: Fragmented MP4 (fMP4) : It generally

: Some older video editors or media players may struggle to open fragmented files directly.