My 12.04 used to be able to play mp4 files, recently it stopped doing it properly, only showing a few frames, the sound continues adn now and then a frame appears but not playing video really..
It used to work before so I guess it has something to do with a recent update ?
Same behaviour in vlc,movieplayer,dragonplayer...
The resolution is rather high 1920x1080.
I downloaded a test mp4 file and plays fine but had smaller res.
But it worked before with my own vids, so...
Not sure where i need to start digging??