[mythtv-users] AC3 / DTS passthrough over nVidia HDMI.

[John P Poet]

On Thu, Apr 9, 2009 at 3:38 PM, Martin Long (myth)
<mythtv at longhome.co.uk> wrote:
> Hi,
>
> I'm having some trouble getting AC3 and DTS passthrough working on myth.
> First let me clarify, I have Linear PCM working with hdmi on myth using:
>
>        alsa:plughw:0,3
>
> This works perfectly, and I get pro-logic surround etc. It also works using
> just hw:0,3 but then, of course my mp3s won't play.
>
> Using alsa:hw:0,3 as the pass through device ALMOST works. If I switch off
> passthrough, I get perfect picture AND sound (but only LPCM). If I switch
> passthrough on, then the picture starts to jerk slightly, and the sound
> jumps in and out (and the DD light on my receiver is going on and off).

I get that behaviour if I use video as the timebase.  Telling Myth to
use audio as the timebase fixes it.

John
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