How to fix "The document "video.mov" could not be opened" in QuickTime, iPhone, VLC
The document "video.mov" could not be opened. The movie's file format isn't recognised.
What this error means
QuickTime could not read the container — usually a missing or damaged index, or junk data.
Why it happens
- Interrupted recording or transfer
- AirDrop or cable transfer stopped early
How to fix it
- Try VLC
- Run the free check here to see whether the index is intact
About QuickTime video files
MOV uses the same box structure as MP4: a moov index plus mdat video data. iPhone and camera videos that stop recording unexpectedly lose the index.