[mythtv-commits] Ticket #8839: DTS Passthrough stutters/choppy/laggy on trunk and if unchecked then crashes playback

MythTV mythtv at cvs.mythtv.org
Mon Aug 30 04:30:17 UTC 2010

#8839: DTS Passthrough stutters/choppy/laggy on trunk and if unchecked then
crashes playback
     Reporter:  mitch.capper@…          |       Owner:  jyavenard          
         Type:  defect                  |      Status:  new                
     Priority:  major                   |   Milestone:  unknown            
    Component:  MythTV - Audio Output   |     Version:  Trunk Head         
     Severity:  medium                  |    Keywords:  DTS, stutter, SPDIF
Ticket locked:  0                       |  
 I am using trunk(25907) and when I play a video in mythvideo with DTS I
 run into an issues.  My setup is set to ALSA:iec857:CARD=intel,DEV=0 for
 audio output device  with DD and DTS checked and speaker config on 5.1
 without upconverting checked.     Playing normal media is fine but when
 playing something with DTS while the receiver is showing DTS received the
 audio stutters heavily (multiple times a second I would say).  Playing
 through mplayer with -afm hwac3 has the DTS audio working just fine.

 Playback without DTS enabled also works fine.

 *) if Stereo mode is enabled instead of 5.1 (as spdif can't pass standard
 surround I believe)  audio works giving stereo sound but no DTS is passed
 through (even though its checked)
 *) If DTS is unchecked but Dolby Digital is left checked (some suggested
 this would convert between the two) I just get lots of entries of:
 getBufferedOnSoundcard() called with pcm_handle == NULL
 followed by:
 2010-08-29 10:08:35.156 Player(4): Waited 100ms for video buffers
 Several times
  in the log and no audio and video does not even play.  Dolby Digital
 encoded items however do play fine (and receiver shows it as receiving DD

 I tried various debug modes but don't see anything that would seem to hint
 towards why there is a stutter.

Ticket URL: <http://svn.mythtv.org/trac/ticket/8839>
MythTV <http://www.mythtv.org/>

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