[mythtv-users] digital audio wiki is wacky.
allen.edwards at oldpaloalto.com
Mon Jul 7 14:24:08 UTC 2008
Peter Schachte wrote:
> Allen Edwards wrote:
>> Assuming that the output of my ATSC capture is ac3, I want that to go
>> to both spdif and analog.
> I don't think that's possible, at least I couldn't get that to work. I
> did get sound to come out of both TV (analog) and stereo (digital), but
> the sound out of the TV was just noise. Loud, speaker-blowing white
> noise. I inferred that it was passing the AC3 signal to the TV in
> digital form (I did select pass-through, after all). So I selected
> digital output only for pass-through, and the TV keeps quiet.
> Unfortunately, this throws off the family when they have the stereo off
> and wonder why they're not getting sound.
> Anyway, I'm attaching my .asoundrc file. Works for me (Mythbuntu 8.04).
Thanks for the reply. I appreciate your help.
I ended up using this setup:
Audio output device: ALSA:spdif
Passthrough output device: ALSA:iec958:(AESO 0x02)
Max Audio Channels: Stereo
Enable AC3 to SPDIF passthrough CHECKED
Enable DTS to SPDIF passthrough CHECKED
Use internal volume NOT CHECKED
Aggressive sound NOT CHECKED
/etc/X11/asound.conf REMOVED (or renamed)
~/.asouncrc REMOVED (or renamed)
and using two external decoders, one for 5.1 and one for 2.0 for the TV.
This gives me bit perfect spdif. I found that using ALSA did not give
bit perfect output because ALSA decodes, processes, then encodes, and is
said to do a less than acceptable job on CD audio.
I do get 44.1KHz audio out from MythMusic and 48KHz audio out from MythTV.
I also use Mythbuntu 8.04.
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