[mythtv-users] All sound out S/PDIF

Bob Sully rcs at malibyte.net
Tue May 20 15:11:50 UTC 2008

Steve Hodge wrote:
> On Tue, May 20, 2008 at 5:32 PM, Bob Sully <rcs at malibyte.net> wrote:
>> I now cannot play 5.1 recordings made from QAM with sound.  Dead
>> silence,
>> and the lights on my receiver do not show an attempt to go to 5.1 DD
>> mode.
>>  In the log, I see this:
>> TV:  Attempting to change from None to WatchingPreRecorded
>> AFD: Opended codec 0x581f790, id(MPEG2VIDEO) type(Video)
>> AFD: Codec AC3 has 6 channels
>> AFD: Opened codec 0x5987130, id(AC3) type(Audio)
>> DPMS Deactivated
>> AFD: Opened codec 0x59b3500, id(MPEG2VIDEO), type(Video)
>> AFD: codec AC3 has 6 channels
>> AFD: Opened codec 0x59ea6c0, id(AC3), type(Audio)
>> Opening audio device 'plug:spdif'. ch6(2) sr 48000
>> Opening ALSA device 'iec958:{ AES0 0x06 }'.
>> AudioOutputError: Channels count (6) not available: Invalid argument
> Are you sure you've got passthrough enabled? It's trying to send 6
> channels
> - it should only be sending 2. When I play a AC3 recording I get:
> AFD: codec AC3 has 6 channels
> AFD: Opened codec 0x8e9f60, id(AC3), type(Audio)
> Opening audio device 'spdif'. ch 2(2) sr 48000
> Opening ALSA audio device 'spdif'.
> Cheers,
> Steve

Hi, Steve:

In Setup -> General, my current settings are:

Audio output device:  ALSA:plug:spdif
Passthrough output device: ALSA:iec958:{ AES0 0x06 }
Max Audio Channels: 5.1
Upmix: Passive (using either of the "Active" options -> no sound from 2ch
Enable AC3 to SPDIF passthrough: checked
Enable DTS to SPDIF passthrough: checked
Aggressive Sound Card buffering: not checked
Use internal volume controls: not checked

Bob Sully - Simi Valley, California, USA

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