Odd Media Problem with HTC One m8

I have a HTC One m8 with about 10 months now and I'm happy with the phone. It is running the latest update of Paranoid Android 5.1 on it, which I am also happy with but, it seems as if I cannot view 720p videos (anything lower res with play fine). When I try to watch videos in 720p videos on Youtube the screen stays blank but the sound plays. I cannot view certain videos on Twitter eg. vines without getting a "Content not available" message at the bottom of the screen but yet, the sound still plays. Same goes for videos on Snapchat. I cant view or record videos with the camera app or snapchat too. Any help would be appreciated as I can literally find NOTHING about it anywhere.

Thanks in advance.