[mythtv-users] prebuffering pause

[George Mari]

Mike Kurtz wrote:
> Have a box set up with a KWorld ATSC115 on SuSE 11.0 with a GeForce 5500. I have XvMC set up properly (substantial drop in CPU usage after I configured it), and sound is working (ALSA:hw:0,0 to avoid pulseaudio). I get full video and audio playback. Ever 5-6 seconds, however, I get a stutter. I look at the console output and I see:
> 
> NVP: prebuffering pause
> <repeated>
> NVP: Prebuffer wait timed out 10 times
> <repeated>
> NVP: prebuffering pause
> WriteAudio: buffer underrun
> <these two repeated/alternated>
> this continues for about a minute, then I see
> NVP:::AddAudioData():pl: Audio buffer overflow, audio data lost!
> <repeated, interspersed with some prebuffering pauses, then becoming more frequent>
> 
> I have extra sound buffer on and aggressive sound buffering off. I'm not using CFS. CPU usage is between 40-70, which is high, but I haven't seen it really spiking, just consistent stuttering.
> 

Are you sure you have extra sound buffering on and agressive sound 
buffering off?

Otherwise start experimenting with PCI latency:

http://www.mythtv.org/wiki/index.php/PCI_Latency