[mythtv-commits] Ticket #8798: DD5.1 does not play correctly when timestretch is enabled.

MythTV mythtv at cvs.mythtv.org
Thu Aug 26 22:04:22 UTC 2010

#8798: DD5.1 does not play correctly when timestretch is enabled.
 Reporter:  jpoet                  |           Owner:  jyavenard  
     Type:  defect                 |          Status:  assigned   
 Priority:  minor                  |       Milestone:  unknown    
Component:  MythTV - Audio Output  |         Version:  Unspecified
 Severity:  medium                 |      Resolution:             
 Keywords:  AC3 DD5.1 timestretch  |   Ticket locked:  0          

Comment (by jyavenard):

 I do not see any bugs here... The system behaves as expected based on the
 information it has.

 You are playing 5.1 AC3 content, when timestretch is enabled audio is
 decoded. Your IEC958 audio reports as supporting 5.1 LPCM audio, so the
 audio isn't re-encoded as AC3 but instead is sent as 5.1 LPCM which can't
 be sent on a SPDIF output.

 So two possibilities are possible here:
 -ALSA drivers are incorrect for your card and reports that your SPDIF port
 supports up to 6 discrete channels
 -Somehow, you've checked the LPCM setting, telling myth to send such

 You wouldn't have seen the problem before, as myth would always re-encode
 the audio as AC3.

Ticket URL: <http://svn.mythtv.org/trac/ticket/8798#comment:2>
MythTV <http://www.mythtv.org/>

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