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Why this video problem happens
Broken videos are unpredictable. Two files with the same extension can fail for completely different reasons. Charging before proof creates frustration when a file is unrecoverable or only partially recoverable.
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.