MOV header repair
MOV header repair: what it usually means
MOV header repair is a technical way to describe missing or damaged QuickTime container structure. The file may lack enough information about tracks, samples, duration, or codecs for players to open it.
If the file has real size, there may still be recoverable frames and audio inside. The safest first move is to leave the original untouched and create a separate repaired preview.
Do not trim, re-export, repeatedly convert, or overwrite the damaged file. If you need to experiment, work from a copy and keep the original exactly as it is.