Video playback freezes when fullscreened

### Issue/Description:
A video will freeze when fullscreened. The audiotrack will keep playing however. Both audio and video plays back as expected when not in fullscreen.

Issue only occurs on nvidia. 

### Version:
`cosmic-player-1.0.8-1.fc43.x86_64`

### Graphics:
`nvidia-driver-595.45.04-1.fc43.x86_64`


