437.mp4 (Reliable ◎)

This newer variant solves the "corruption risk" by changing how data is stored:

: Some older video editors or media players may struggle to open fragmented files directly. 437.mp4

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) This newer variant solves the "corruption risk" by

: Because the segments are decodable on their own, playback can start after downloading only a tiny portion of the file, making it ideal for high-efficiency streaming. : It generally works best with standard codecs like H

: 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

: 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.