[snip]Hey all,
My appollogies if this has already been covered, but I just worked around a nasty hangup and I'm pretty excited about it, so I thought I'd share in case anyone else is where I was for about the last 4 days.
Exactly the output in the post. Apparently the problem is with OpenGL vsync and NVidia drivers.[snippage]
Elsewhere in the thread someone mentioned that you can disable OpenGL VSYNC in Myth by commenting out the OpenGL VSYNC block in the settings.pro file in the Myth source directory and recompiling from scratch
My Uneducated Theory:
Backtrace on the same crash shows that it's crashing inside the OpenGL library provided by NVidia
Yes. What nVidia version are you running? Anything prior to 6111 is known to cause this problem.
Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 196616 (LWP 1055)] 0xb64ec226 in _nv000833gl () from /usr/lib/libGLcore.so.1 (gdb) bt #0 0xb64ec226 in _nv000833gl () from /usr/lib/libGLcore.so.1 #1 0xb73d4210 in _nv000030gl () from /usr/lib/libGL.so.1 #2 0x00030008 in ?? () #3 0x0000041f in ?? () #4 0xb7f2dda8 in ?? () from /usr/lib/libmythtv-0.16.so.0 (gdb) kill
If it's crashing because it can't open /dev/dri/card0, thien it makes sense, because there's no such file in my /dev filesystem.
No, the nVidia driver is not looking for /dev/dri/card0. That's for the "DRI" vsync method (which fails, because your hardware doesn't support it). /dev/nvidia0 (another vsync method, the vblank ioctl method message) *is* there, but also fails because your nVidia driver version is too new. OpenGL is the first one that succeeded.
If you can get it to work, OpenGL will give better video smoothness than RTC (which you are probably using), or usleep w/ busy-wait (which also consumes more CPU). As an exercise, see if you can spot the --verbose playback output that tells you which you're using, and if it's not RTC, search the list archives to see what to do about it.
-Doug
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