What video options are being used for gmplayer? I've found that using a sound server for output (esd/arts) introduces the lag as it is parsed through the sound server...
furthermore, since opengl is not supported on my laptop, (thanks to ATI for not releasing drivers for Mobility 320M!), I need to use another video rendering method.
The best options that work for me are xv for video and alsa for sound. Try passing these parameters to mplayer.
mplayer -vo xv -ao alsa %s
or set them up manually through gmplayer. I also wouldn't be afraid to enable frame dropping.... often it's the difference between one or two frames that keeps WMV files in sync.
The last step, if you haven't done so already, is to add the rtc-max-user freq to your /etc/sysctl.conf
dev.rct.max-user.freq = 1024
Just a few things to try out.
Check if this helps:
mplayer -ao sdl movie_file.wmv
Yeah, I noticed this too after an upgrade a few days ago.
Not sure what was upgraded, but I used to connect to cnn.com and flightlevel350.com and view the videos, but now they lag really bad.
Also, kmplayer for Konqueror simply doesnt work anymore.
Interestingly enough, I deleted my .mozilla and now media is playing just fine. Must have been something in my cache...
Give that a try and see what happens...