VLC could repair and play the corrupted file in the new format. Go to Media > Convert/Save. Add and select the corrupted MP4 file. Reddit·r/software
If the header is completely missing, software needs a "map" to understand how to read the raw data. This requires a —a healthy video recorded with the same camera and settings as the broken one. Best Ways to Repair Corrupted MP4 Video File. : r/software nippy user since 2015 mp4 fix
Click the button next to "Destination file" to name your new, fixed video. VLC could repair and play the corrupted file
Below is a comprehensive guide on how to fix unplayable MP4 videos using modern and legacy techniques. Understanding MP4 Corruption nippy user since 2015 mp4 fix