[mythtv-users] HELP: What is meaning of "NVP: Video is 16.2157 frames ahead of audio, doubling video frame interval to slow down."

[Mitch Gore]

On Fri, Dec 5, 2008 at 2:17 PM, Jeffrey J. Kosowsky
<mythtv-users at kosowsky.org> wrote:
> I believe this is the cause of the problems I am experiencing with
> slow video, and halting sound.
>
> Specifically:
> - HD video is good quality & smooth but slow.
> - Sound is normal quality and speed/frequency, but stops every few
>  seconds (though no sound is missing).
> It seems like sound is stopping every couple of seconds to wait for
> the slow video to catch up.
>
> This would be consistent with the error message that I get with each
> audio pause:
>          WriteAudio: buffer underrun
>
> However, this symptom seems like the OPPOSITE of the message that I
> get when I turn on "-v playback":
>        Video is N.nnnn frames ahead of audio, doubling video frame
>        interval to slow down.
>
> where N ranges from about 8 to 16 frames -- which would be consistent
> with approximately the length of the audio pauses.
>
> So my questions are:
> - Is this a video problem or an audio problem?
> - Is this a cpu or graphics card speed problem?
> - What do I need to do to troubleshoot & fix?
>
> Note: I have a 2.8GHz P4 (old) with a new GeForce 6200 card.
> Mythfrontend uses about 40-45% of CPU.
> X uses about 4-6% (using XvMC)
> Mythbackend uses about 15%
> Pulseaudio uses about 8%.
>
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Did you try enabling extra audio buffering in tv playback general settings?

Mitchell