My guess as to the cause of that corruption is that the file was slightly fragmented, but the fragments were pretty close together, and streaming video formats are resilient enough to tolerate some garbage in the middle of the stream.

IIRC photorec should be able to handle this.

Depending on your platform and what codec is used during playback, the corruption may be handled differently. The player might crash.

Best to scrub the file and properly reformat to remove corruption.

Another crazy thing - if the corruption is indeed due to fragmentation, the garbage bytes may in fact be another customer’s data! Or your company’s data, or whatever, you just don’t know.

You’re handing out random blocks of your disk to a customer, embedded in a video.

Depending on the type of business you run, you might not want to do this.

The format also gives the decoder ways to re-synchronize with the stream. That isn't guaranteed to be possible for arbitrary formats.