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remux them into MKV– gamer0Commented Jun 16, 2018 at 13:57
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Normally this issue only happens when you transfer mp4 files from a phone to PC, never heard of this happening on just a rename.– MoabCommented Jun 16, 2018 at 14:10
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1"become unplayable just if a process is running and destroying them" I would scan your system for malware or virus.– MoabCommented Jun 16, 2018 at 14:11
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@Moab I have scanned my system with Avast, Malwarebytes antimalware and AdwCleaner. Everything is fine.– papakiasCommented Jun 16, 2018 at 14:21
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@Moab the files come from my phone. The funny thing though is that I first copy them to desktop and they play normally. When I put them into folders and move them elsewhere, then the problem happens. It even corrupts old files that I have.– papakiasCommented Jun 16, 2018 at 14:23
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