[mythtv-users] prebuffering pause

[Mike Kurtz]

Okay, I disabled deinterlacing completely, and now HD signal works perfectly (allowing for my cheap antenna). This suggests to me that the video card or CPU aren't keeping up with the audio (along with the "Video is 3-5 frames behind" messages in the log), but this really shouldn't happen. I'm running on slim (with standard deinterlacing) on a Celeron 356 and a GeForce 5500, and it loses ~4 frames every 6 seconds, stutters and resyncs, which is where I get the prebuffering pause errors in stdout.



----- Original Message ----
From: Mike Kurtz <fnorbenden at yahoo.com>
To: Discussion about mythtv <mythtv-users at mythtv.org>
Sent: Saturday, January 3, 2009 5:46:16 PM
Subject: Re: [mythtv-users] prebuffering pause

Those settings are set correctly.

I tried many different variations of PCI latency, all of them actually made the playback worse.



----- Original Message ----
From: George Mari <george_mythusers at mari1938.org>
To: Discussion about mythtv <mythtv-users at mythtv.org>
Sent: Saturday, January 3, 2009 8:40:40 AM
Subject: Re: [mythtv-users] prebuffering pause

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

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