Question / Help Problem with opening file // computer crashed

Yep, it's just digital trash now. Sorry.
There are tools to 'repair' MP4s, but most of them are for-pay, and none of them work right with the video files that OBS outputs (I paid for one when I had a crash and really wanted the video back, only got segments with video, and badly warped audio). I'd advise against wasting time (and money) with these, like I did.

Definitely switch to FLV for standard recording. If you need MP4, transmux the video over afterward. It's really quick and easy to do.
 
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