A thing that can destroy most files in terms of readability is a bit flip in the header section. These could be theoretically corrected with clever guesswork and a hex editor, but in practise it is going to be hard to know where the bit flip occured, when a file just can't be read anymore.
Good catch. I had omitted that since I was not familiar with the low level details of the file formats (e.g. would a video file duplicate that data throughout it for enabling live streaming), but if the file only has one copy of important information (e.g. I-frame spacing, dimensions) and that gets corrupted, boom.
