When I toggle full screen mode in MPlayer, for some reason it just makes everything around the video turn black, but it doesn't stretch the image. I believe that the image is supposed to be stretched, and so there is my problem with MPlayer. With GMPlayer, when I try to play a file, it comes up with an error that probably has something to do with my xorg.conf file and my video cards. The fatal error is:

Error opening/initializing the selected video_out(-vo) device.

I installed the nvidia drivers for one of my video cards. The nVidia GeForce2 MX400/440 is the video card occupying my VGA slot. My other video card is an on board SiS card. I backed up my xorg.conf file, and when I changed the line:

driver "VESA"
to
driver "nvidia"

X Windows wouldn't startup, so I replaced the xorg.conf with the backup and X Windows works. I believe that the xorg.conf file is looking at my onboard SiS video card, as opposed to my nVidia card, but I don't know enough about the xorg.conf file to be able to change it properly. My monitor is hooked up through my nVidia card, which would mean that I am using my nVidia card, but why wouldn't the drivers work then? I'm a little confused, as I'm rambling and probably stopped making sense a while ago. Can someone please help me with this problem? Thank you.

Regarding your mplayer, open the GMplayer, and then right click on the big window and hit "preferences". Then go to the Video tab and try different output drivers.

try -fs -zoom with your mplayer command line while trying the different -vo options.

I tried that already, but I can't configure any of them. When I try to open a file, it crashes the program with a whole bunch of errors, really long errors...

- MPlayer crashed because of bad usage of CPU/FPU/RAM.
Recompile MPlayer with --enable-debug and make a
'gdb' backtrace and
disassembly. Details in
DOCS/HTML/en/bugreports_what.html#bugreports_crash.

Hmmm. Maybe I can figure out what to do. I don't know how to do a disassembly, but maybe that document will explain how. Thanks, but this might not be over yet. I don't actually know what a 'gdb' backtrace is. Can someone explain that to me?

Yeah Mplayer's been slacking lately, not sure why. Doing what whansard said should get your player a bigger picture. But doing it in the preferences in the gui just crashes it. It never did that with prior versions.

x.org users have been having tons of problems with crashing in mplayer. My understanding is that it's a known issue, and the x.org people are working on it.

Meanwhile, a workaround is not to use x.org.