[mythtv-users] EXTREMELY choppy video

[Jarod Wilson]

On Thursday 17 March 2005 18:17, Paul Leppert wrote:
> Here is the result of mythfrontend -v playback and playing back a
> 1080i stream with the XvMC checkbox checked:
[...]
> 2005-03-17 19:43:41.465 Over/underscan. V: 0, H: 0, XOff: 0, YOff: 0
> Using XvMC version: 1.0
> 2005-03-17 19:43:41.471 XvMCSurfaceTypes::find(w 1920, h 1, c 0, i 2,
> m 0,sw 0, sh 139, disp, p<= 139, 10880 <=p, port, surfNum)
> 2005-03-17 19:43:41.471 Trying XvMC port 139
> 2005-03-17 19:43:41.471 XvMCSurfaceTypes::find(w 1920, h 1, c 1, i 2,
> m 0,sw 0, sh 139, disp, p<= 139, 10880 <=p, port, surfNum)
> 2005-03-17 19:43:41.471 Trying XvMC port 139
> 2005-03-17 19:43:41.472 XvMCSurfaceTypes::find(w 1920, h 1, c 0, i 2,
> m 0,sw 0, sh 139, disp, p<= 139, 10880 <=p, port, surfNum)

Something looks goofy there... w 1920 is correct, but I don't think h 1 is 
right (should be 1080)... Have you possibly made changes to the video output 
size, done something with xrandr, etc, and accidentally set the horizontal 
size to 1?

> 2005-03-17 19:43:41.656 prebuffer wait timed out..

Not a good thing.

> 2005-03-17 19:43:43.759 Realtime priority would require SUID as root.

Won't be a huge help to fix this, but every little bit adds up w/HDTV... Like 
someone else suggested, chmod +s the frontend binary.

> 2005-03-17 19:43:43.889 nVidiaVideoSync: VBlank ioctl did not work,
> unimplemented in this driver?

No worries, the vblank ioctl is only 4663 and earlier nvidia drivers, I see 
the same.

> 2005-03-17 19:43:43.889 DRMVideoSync: Could not open device
> /dev/dri/card0, No such file or directory

Also not a problem.

> 2005-03-17 19:43:43.889 RTCVideoSync: Could not set RTC frequency,
> Permission denied.

echo 1024 > /proc/sys/dev/rtc/max-user-freq

That may help a little bit also. I use OpenGL for vsync myself, but this one 
worked well enough for me as well.

> 2005-03-17 19:43:44.160 waiting for prebuffer...
> 2005-03-17 19:43:44.230 A/V diverged by -30 frames, dropping frame to
> keep audio in sync
> 2005-03-17 19:43:44.233 dropping back audio_buffer_unused
> 2005-03-17 19:43:44.296 A/V diverged by 30 frames, extending frame to
> keep audio in sync

Seems familiar to me, I had some messages like that at one time, but I don't 
remember exactly what fixed what anymore...

> I get a bunch of the last message in a row and performance with XvMC
> is really poor (and CPU usage on an XP 2000+ is pegged at 100%).

Hm, not so good, that definitely shouldn't be the case.

> I don't know what is different, but today I do get the black and white
> OSD, so XvMC is definitely working.  Additionally, non-XVMC is even
> worse (just get a blue screen with audio, no picture).

Huh. Beats me...

> I'm assuming the following messages are bad?

Not fatal, no.

> 2005-03-17 19:43:43.889 nVidiaVideoSync: VBlank ioctl did not work,
> unimplemented in this driver?

Nope, see above.

> 2005-03-17 19:43:43.889 DRMVideoSync: Could not open device
> /dev/dri/card0, No such file or directory

Nope, not a problem, I don't think the nvidia driver supports that method.

> 2005-03-17 19:43:43.889 RTCVideoSync: Could not set RTC frequency,
> Permission denied.

See above on this one.

> Any ideas?

Not at the moment, save things I've already written above...

-- 
Jarod Wilson
jarod at wilsonet.com

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