these 56 MP4s are coming from (e.g., camera, website, editing software)?
If your default player (QuickTime, Windows Media Player) won't play an MP4, try VLC Media Player , which supports nearly all video formats. 56 mp4
If MP4s import into editors (like After Effects) as green or broken, try disabling hardware-accelerated decoding in the application preferences. Managing Large Numbers of MP4 Files these 56 MP4s are coming from (e
If you are dealing with a bulk set of videos (e.g., 56 separate MP4s): try VLC Media Player
If an MP4 file is corrupted, you can try re-encoding it using tools like Adobe Media Encoder to resolve issues with red screen frames or playback failures.