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

[Martin Long (myth)]

> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org [mailto:mythtv-users-
> bounces at mythtv.org] On Behalf Of John P Poet
> Sent: 09 April 2009 23:34
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] AC3 / DTS passthrough over nVidia HDMI.
> 
> 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.
> 

[Martin Long] 
Indeed. I just thought of that too, whilst watching house. Makes a lot of
sense, as it can't 'distort' the sound to match the video when it's an AC3
stream, hence, dropouts. I'll give it a go when this episode has finished...

... and SUCCESS!! 

Thanks for the help.