[mythtv-users] AC3 passthrough not working

[Allen Edwards]

On Sat, Apr 11, 2009 at 2:22 AM, Glenn Sommer <glemsom at gmail.com> wrote:

> Hi
>
> After a LOT if fighting with this problem... I FINALY made it work!
>
> Here's what I did.
>
> 1. Upgraded to alsa 1.0.19 (not sure if I needed to though).
> 2.  added a /etc/asound.conf file containing:
> pcm.!default {
>        type plug
>        slave {
>                rate 48000
>                pcm "spdif"
>                }
> }
>
> 3. Deselected "use video as timebase" in MythTV.
>
> Now regular channels work (sending PCM over SPDIF to my receiver), and
> HD channels with sending AC3/DTS directly to the receiver over SPDIF.
> :D
>
>
> Maybe there should be some warning with "use video as timebase" - as
> it does NOT with when using passthrough.. ?
>
>
Could you try it without the "rate 48000" line and let me know if it works.
 It is my belief that adding that line might cause alsa to sample and
re-encode and thus degrade the data although I am not sure.  It works
without that line on my system.

Allen
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