[mythtv-users] what is a : WriteAudio: buffer underrun?

[belcampo]

Paul wrote:
> On 25/11/2009 9:15 PM, Paul wrote:
>> I'm getting alot of these during playback along with some pauses , can 
>> someone explain to me what the cause of these are?
>> is it a Audio problem or Video problem?
>>
>> 2009-11-25 20:47:48.049 WriteAudio: buffer underrun
>> 2009-11-25 20:49:24.993 WriteAudio: buffer underrun
>> 2009-11-25 20:58:54.003 WriteAudio: buffer underrun
>> 2009-11-25 20:58:54.984 WriteAudio: buffer underrun
>> 2009-11-25 21:01:18.016 WriteAudio: buffer underrun
>>
>>
>> Paul
>>
> 
> I turned on frontend playback debug
> note I'm using VDPAU normal profile
> I now have a 8500 GT with 1GB ram surely this is fast enough for this video
> and these are the messages that seem to relate to the underrun:
> 
> 
> 'video_output' mean = '39995.59', std. dev. = '161.42', fps = '25.00'
> 2009-11-29 17:29:24.986 WriteAudio: buffer underrun
> 2009-11-29 17:29:25.034 NVP(0): Video is 3.86602 frames behind audio 
> (too slow), dropping frame to catch up.
> 2009-11-29 17:29:25.034 NVP(0): Video is 4.6745 frames behind audio (too 
> slow), dropping frame to catch up.
> 2009-11-29 17:29:25.034 NVP(0): Video is 5.03088 frames behind audio 
> (too slow), dropping frame to catch up.
> 2009-11-29 17:29:25.034 NVP(0): Video is 5.04815 frames behind audio 
> (too slow), dropping frame to catch up.
> 2009-11-29 17:29:25.034 NVP(0): Video is 4.8111 frames behind audio (too 
> slow), dropping frame to catch up.
> 2009-11-29 17:29:25.034 NVP(0): Video is 4.38333 frames behind audio 
> (too slow), dropping frame to catch up.
> 2009-11-29 17:29:25.034 NVP(0): Video is 3.81247 frames behind audio 
> (too slow), dropping frame to catch up.
> 2009-11-29 17:29:25.034 NVP(0): Video is 3.1406 frames behind audio (too 
> slow), dropping frame to catch up.
> 'video_output' mean = '52594.58', std. dev. = '162213.41', fps = '19.01'
> 2
I know nothing about VDPAU, but it seems it doesn't work as it's 
configured now, because you only get 19.01fps instead of 25fps
> 
> 
> 
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