Thanks very much for uploading the clip!
It's clearly damaged, because I also get the normal audio but frozen video in every app I've tried: VLC, Movies & TV, WMP, the original QuickTime Player and PD17. I also tried converting it using VirtualDub2, but the converted clip has the same issue.
It might be possible to repair the clip by trying other conversion or video repair apps, but the quickest answer is to not use it in your project.
I would definitely bring this up on the GoPro forum and directly with their tech support. You can use the same Dropbox link over there so they can access the clip and do a more though analysis/investigation.
This message was edited 1 time. Last update was at Jun 24. 2019 13:46
YouTube/optodata
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