[mythtv] 'WriteAudio: buffer underrun' during playback caused by the scheduler

[Jan Kleinig]

Are you playing the files with the internal player? Than it is the 
same... Take a look at your backend-log during playback (tail -f 
/var/log/mythtv/mythbackend.log) and you will see, that the problem 
occures every time, when the scheduler reschedules... If it is not that, 
you got another problem ;)


Brian C. Huffman schrieb:
> I'm getting similar problems during playback.  I don't think it's caused
> by the scheduler though...I'm seeing it on playing videos that have been
> ripped from DVD.  I'm about to open a ticket.
>
> -b
>
> On Sat, 2006-09-09 at 17:21 +0200, Jan Kleinig wrote:
>   
>> Hi,
>>
>> I'm still having those problems :(
>>
>> I am using Knoppmyth R5C7 with mythtv svn 11084 and the ac3-patch 0.20
>> written by Mark Spieth.
>>
>> I'm using the EIT Scanner because tvtoday doesn't support that many
>> channels and I hate hunting for a new script when they change the
>> layout of there homepage...
>>
>> The problem is, that every time when the scheduler 'reschedules', I
>> get audio problems in the recording or LiveTV I watch.
>>
>> The backend log says:
>>
>> 2006-09-09 17:11:26.371 EITScanner: Added 10 EIT Events
>> 2006-09-09 17:11:26.375 Reschedule requested for id -1.
>> 2006-09-09 17:11:28.878 Scheduled 36 items in 2.5 = 1.19 match + 1.31
>> place
>>
>> At the same time, the playback stumbles and the audio is gone in most
>> of the cases. Sometimes, the audio comes back to live again after
>> about 3 seconds... The frontend tells me this:
>>
>> 2006-09-09 17:10:48.608 TV: Attempting to change from None to
>> WatchingPreRecorded
>> 2006-09-09 17:10:48.627 libavformat type mpegts
>> 0: start_time: 2615.887 duration: 539.622
>> 1: start_time: 2615.963 duration: 539.611
>> 2: start_time: 2615.896 duration: 539.616
>> stream: start_time: 29065.414 duration: 5996.522 bitrate=2668 kb/s
>> 2006-09-09 17:10:48.635 AFD: Opened codec 0x8bc9330, id(MPEG2VIDEO)
>> type(Video)
>> 2006-09-09 17:10:48.635 AFD: Setting maxchannels to 6, -1
>> 2006-09-09 17:10:48.635 AVFD: codec MP3 has 2 channels
>> 2006-09-09 17:10:48.635 AFD: Opened codec 0x8b52c10, id(MP3)
>> type(Audio)
>> 2006-09-09 17:10:48.826 Opening audio device 'default'. ch 2 sr 48000
>> 2006-09-09 17:10:48.826 Opening ALSA audio device 'default'.
>> 2006-09-09 17:10:49.005 VideoOutputXv: XvMCTex: Init failed
>> 2006-09-09 17:10:49.005 VideoOutputXv: XVideo Adaptor Name: 'ATI
>> Radeon Video Overlay'
>> 2006-09-09 17:10:49.398 TV: Changing from None to WatchingPreRecorded
>> 2006-09-09 17:10:49.399 Using realtime priority.
>> 2006-09-09 17:10:49.430 Video timing method: USleep with busy wait
>> 2006-09-09 17:11:26.752 WriteAudio: buffer underrun
>> 2006-09-09 17:11:27.247 WriteAudio: buffer underrun
>> 2006-09-09 17:11:27.521 WriteAudio: buffer underrun
>> 2006-09-09 17:11:27.776 WriteAudio: buffer underrun
>> 2006-09-09 17:11:28.339 WriteAudio: buffer underrun
>>
>> You see, at 17:11:26.375 the rescheduling is getting startet and at
>> that time, the error occures...
>>
>> Does anybody have an idea what to do?
>>
>> Thanks!
>> _______________________________________________
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>> mythtv-dev at mythtv.org
>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-dev
>>     
>
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