@Discerptor
There's also the problem that the video halts whenever you press a button or open a menu. If the video output is set to a separate window, then that window runs with the mplayer process separate from the GUI. Otherwise the GUI gets the video through shared memory and does everything in one single thread which I guess causes these problems.
@SPC1st
Try adding this to the command line options in the advanced preferences tab:
Code:
-ass-color ffffff00
(Assuming you have ass subtitles enabled. If so, even non-ass subtitles get rendered by libass).
@GreenyOSX
The GUI puts an additional strain on the CPU. With integrated video the GUI uses about 5% and without about 2% CPU on my machine. Subtitle rendering also uses a bit of CPU power.
So it could be that the video barley plays in the command-line mplayer and doesn't play anymore with the added strain of the gui and subtitles.
Open the activity monitor and check if you CPU is maxed out.