I always favor MPlayerX as my video player, it works perfectly. However since a few days, when playing fullscreen, it seems to no longer interpolate the video content, resulting in a 'pixelated' output.
If I compare it with QuickTime or VLC for example, using the same video file, with MPlayerX I can see pixel blocks in the output, the typical jagged edges from image stretching, whereas it looks smooth in other players.
I already removed + reinstalled it, no difference. I checked all the settings, couldn't find anything related, I changed 'image enhancement' between None, Normal, and Advanced, no difference.
In case it's relevant: I upgraded to El Capitan earlier this week. Can't tell for sure but this problem started somewhere around the same time. Can it be related, and if yes, is there any El Capitan-specific setting involved that could fix this?