None of my x265 videos (MKV wrapper) will play. VLC starts, I get a series of flashing black video screens for approximately 3 seconds and then I get the "audio only" screen with only the audio playing.
Default settings. WIN8.1. 16GB ram. No external video card - just using the HD4600 graphics capabilities of my Intel i7-4790 3.60 GHz processor.
PotPlayer has no problems at all. I've tried various combinations of removing hardware-accelerated decoding, and using different codecs (3D11, 3D09, DXVA) to no avail. Never had a problem with any x264 or other file formats. This is simply an x265 issue.