VLC won't play video
Why this video problem happens
VLC can play many damaged or unusual media files, but it still needs enough structure to identify streams, codecs, and timing. If VLC opens a file as blank, reports zero duration, or fails to seek, the container may be too damaged for normal playback.
Most camera-style recordings are more than a stream of pictures. They also need a readable container, indexes, track metadata, timestamps, codec information, and audio/video relationships. If a recording is interrupted at the wrong moment, the actual media data can remain on disk while QuickTime, VLC, Photos, or another player reports the file as empty, zero seconds long, or unsupported.
That is why a broken video can look impossible even when the file size is large. A 1 GB recording that shows 00:00 is often not empty; it may simply be missing the instructions that tell playback software where the frames and audio packets live. Repair starts by treating the file as evidence, not as a normal playable movie.