Stay away from VLC whatever VLC since I'm avid reader and writer and I've read a lot about it. Even VLC says that they're not the best player out there and when come to problems and they've posted a lot saying that they are trying to make the most compatible player possible. So it's not the best. You can argue.
1st possibility -
During my same problems as yours. I've changed to DivX player because I discovered DivX use different plugin and the video was DivX made and every different player use his own plugins for HEVC or libde265, as I remember.
2nd possibility -
Hardware compatibility. Try another computer instead and with recent graphic adapters like NVIDIA or AMD.
3rd possibility -
Play the video on Linux if you're using Windows and the reverse if you're using Linux play it on Windows.
I'd resolved easily the same problems as yours years ago as green screens, lines on the screen, video playing with lags and video not playing at all. All by using these methods above.
Hope it helps!
Edit: Changing to recent graphics adapter that may or not resolve your problem same as trying to play HVEC on Android devices. Because a lot hardware compatibility issues developers are trying to make it possible!