: Download the VLC Media Player from VideoLAN . It is a free, cross-platform player that can decode almost any MP4 regardless of the internal codec. 2. Troubleshooting Playback Issues
: You can trim or edit the file using free software like CapCut or Clipchamp. How to play MP4 files in Windows - Microsoft Support b0069.mp4
If the file won't open or only plays audio with a black screen: : Download the VLC Media Player from VideoLAN
: Because MP4 is a universal standard, you can upload it directly to YouTube or social media platforms like Instagram without needing to convert it. b0069.mp4