Opened 13 years ago

Closed 12 years ago

#5384 closed defect (duplicate)

AC3 passthrough does not function when Max Audio Channels set to '5.1', only when set to 'Stereo'

Reported by: kidcharlemagne87@… Owned by: Isaac Richards
Priority: minor Milestone: unknown
Component: mythtv Version: 0.21
Severity: medium Keywords: ac3 5.1 passthrough max audio channels
Cc: Ticket locked: no


I have set up the audio to passthrough ac3 encoded sound (5.1 channels) to my external digital audio receiver. Ironically, in the Setup->General->Audio screen in the Frontend, if I choose '5.1' for 'Max Audio Channels' the passthrough does not work, and only silence is heard on my speakers. If I set it instead to 'Stereo', I get proper passthrough and full 5.1 channel sound on the speakers.

Change History (4)

comment:1 Changed 13 years ago by anonymous

I can confirm that this happens to me as well, running the latest 21-fixes SVN.

comment:2 Changed 13 years ago by anonymous

This happens to me too. Here is what I see from a log on the frontend.

2008-06-08 14:27:00.714 AFD: Opened codec 0x867c930, id(MPEG2VIDEO) type(Video) 2008-06-08 14:27:00.714 AFD: codec AC3 has 6 channels 2008-06-08 14:27:00.715 AFD: Opened codec 0x964cb40, id(AC3) type(Audio) 2008-06-08 14:27:01.246 AFD: Opened codec 0x964cb40, id(MPEG2VIDEO) type(Video) 2008-06-08 14:27:01.246 AFD: codec AC3 has 6 channels

I think this is the relevant part. I see no errors anywhere.

aplay -L default:CARD=CK804

NVidia CK804, NVidia CK804 Default Audio Device


NVidia CK804, NVidia CK804 Front speakers


NVidia CK804, NVidia CK804 4.0 Surround output to Front and Rear speakers


NVidia CK804, NVidia CK804 4.1 Surround output to Front, Rear and Subwoofer speakers


NVidia CK804, NVidia CK804 5.0 Surround output to Front, Center and Rear speakers


NVidia CK804, NVidia CK804 5.1 Surround output to Front, Center, Rear and Subwoofer speakers


Discard all samples (playback) or generate zero samples (capture)

comment:3 Changed 12 years ago by foobum@…

#5900 will fix

comment:4 Changed 12 years ago by Dibblah

Resolution: duplicate
Status: newclosed
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