[mythtv-commits] Ticket #10797: Audio/Video sync problems especially after seeking to start of recording

[MythTV]

#10797: Audio/Video sync problems especially after seeking to start of recording
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 Reporter:  dmoo1790@…                  |          Owner:
     Type:  Bug Report - General        |         Status:  new
 Priority:  minor                       |      Milestone:  unknown
Component:  MythTV - Video Playback     |        Version:  0.25-fixes
 Severity:  medium                      |     Resolution:
 Keywords:  audio video sync 0.25 seek  |  Ticket locked:  0
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Comment (by Steven Ellis <steven@…>):

 Ok I think I have a fix. Checking logs I saw the following alsa error
 {{{
 Jun 17 20:30:10 mythtv mythfrontend[20861]: E CoreContext
 audio/audiooutputalsa.cpp:545 (OpenDevice) ALSA: Unable to sufficiently
 increase ALSA hardware buffer size - underruns are likely
 }}}
 and recommendation
 {{{
 Jun 17 22:36:39 mythtv mythfrontend[26876]: E CoreContext
 audio/audiooutputalsa.cpp:213 (SetPreallocBufferSize) ALSA: Try to
 manually increase audio buffer with: echo 128 | sudo tee
 /proc/asound/card0/pcm1p/sub0/prealloc
 }}}
 I've actually bumped the prealloc up a bit higher to be certain
 {{{
  echo 256 > /proc/asound/card0/pcm1p/sub0/prealloc
 }}}
 Just tested some files and sync is close to perfect and I'm not seeing any
 audio centric errors.

 Steve

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Ticket URL: <http://code.mythtv.org/trac/ticket/10797#comment:11>
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