This problem has been hounding me for a while. If anyone knows how to fix it, well, you're my new hero.

When I run OpenGL applications, I have a problem where the sound is about a second behind the graphics. This seems to happen only in OpenGL applications--Tuxracer, Supertux, and GL-117 to name a few. Take Tuxracer for example: I run over the fish, I hear the pop a second later. Movie applications like XINE are perfectly synced, as are almost all other games and applications I've tried. But these OpenGL games are killing me.

I'm running Fedora Core 4, kernel 2.6.12-1.1447. My video card is an NVIDIA GeForce MX 4000, my soundcard (if that matters) is a SoundBlaster Live. I have updated the kernel with Livna's NVIDIA kernel module and NVIDIA-GLX mod.

I'm not sure what other information I need to post. I eagerly await your help.

Thank you.

The problem is not with OpenGL but with SDL
SDL may use aRts (KDE's sound system as its sound subsystem)
aRts is famed for its high latency. apart from that tuxracer itself has problems syncing grafix with sound.

Somehow if you try to force SDL to use OSS driver directly (I dont know how. can anyone please tell me?) I face exactly the sme problem as you.

Sorry

I had the same problem when I used to run KDE 3.3 on Fedora Core 3 on my Laptop. Strangely enough the sound seemed synced when I logged into Gnome, which led me to think it had something to do with KDE and not SDL per se, although the problem was present at supertux, frozen bubble and tux racer, all SDL games.

I had the same problem on FC4, kde, and mplayer. Xine worked fine, that is the video and audio were in sync. Things got a lot better when I edited the $HOME/.mplayer/config file as shown below


vo=xv,x11
#ao=arts,esd,oss
ao=oss