video won't play
video won't play: what it usually means
When someone searches for video won't play, they may be seeing a blank player, a codec error, a frozen first frame, or a file that opens and immediately closes. The phrase is broad, but the intent is sharp: the person wants to know whether the video can be saved and which first step is safest.
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.