Exported video file isn't playable

I've tried to export the same project twice, once as in out, and once as contents, and each time the export process has gone all the way through with no errors, but when I go to play the video file, or try to upload it anywhere it tells me the file isn't playable, and to require it. I have no idea why this is happening, or what this means, and any help is genuinely appreciated.


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