1, open the mp4 video file repairer.

2, the MP4 file has a virus, update the antivirus software to check the file properly maybe the file is fine.

3, find the source of the MP4 file, copy and paste it again, and overwrite the original MP4 file.

4, MP4 player itself there are problems caused by the illusion of file corruption, may be the MP4 decoding circuit failure or program error caused by the repair or upgrade firmware program, or restore the factory settings.