[mythtv-users] 0.17 kernel 2.6.11 problem

Nick knowledgejunkie at gmail.com
Thu Apr 14 18:24:06 UTC 2005


On 4/13/05, Troy Roberts <troy.w.roberts at gmail.com> wrote:
> I have a single backend driving 2 frontends - all debian based.  I
> recently updated them al to the 2.6.11 kernel
> kernel-image-2.6.11-1-686  I now have a significant amount of
> 'stutter' druing playback on both frontends
> 
> Each frontend has a slightly different hardware config (mobo, audio,
> cpu speed) but the same video card (nvidia), intel procs, etc.
> 
> The backend is capturing everything fine because if I copy the .nuv
> file over to a windows box or to my videos dir they play fine
> (including in mplayer), it is just during myth playback that the
> problem seems to exist.
> 
> I have tried the following:
> 
> - renice the mythfrontend process
> - renice the mythbackend process
> - set use video as timebase
> - set agressive audio buffering
> - monitored my local lan (100Mb FDX) to look for network congestion
> 
> Does anyone have any suggestions as to what may be causing this? Is it
> a myth problem, or a linux kernel problem?
> 
> FWIW, I captured a number of prebuffering messages in the mythfrontend log:
> 
> 2005-04-07 23:36:45.567 WriteAudio: Preparing 4096 bytes (1024 frames)
> 2005-04-07 23:36:45.567 audio waiting for space on soundcard: have 368 need 4096
> 2005-04-07 23:36:45.574 audio waiting for space on soundcard: have 1676 need 409
> 6
> 2005-04-07 23:36:45.581 audio waiting for space on soundcard: have 3020 need 409
> 6
> 2005-04-07 23:36:45.588 Broadcasting free space avail
> 2005-04-07 23:36:45.588 WriteAudio: Preparing 4096 bytes (1024 frames)
> 2005-04-07 23:36:45.588 audio waiting for buffer to fill: have 512 want 4096
> 2005-04-07 23:36:45.588 Broadcasting free space avail

 <snipped>

> Thanks in advance - any help would be muchly appreciated
> Troy

Are you using the latest ALSA release, or have you manually compiled
ALSA after having installed the new kernel? A number of people have
found that by upgrading to the latest ALSA the pauses have been
solved.

Nick


More information about the mythtv-users mailing list