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
you are having with them (e.g., not playing, broken format, too large)? I can give you a more specific solution. 56 mp4
Use file management software to organize large volumes of video data to prevent "metadata" issues where the computer cannot identify the video/audio tracks. If you can tell me more about: If MP4s import into editors (like After Effects)
If you are dealing with a bulk set of videos (e.g., 56 separate MP4s): 56 separate MP4s):