[mythtv-users] AC3 audio problems

[Nick Rout]

On Mon, Jan 12, 2009 at 7:50 AM, Eric Sharkey <eric at lisaneric.org> wrote:
> I have some problems playing some recordings that have AC3 audio tracks.
>
> I know that my hardware is working ok.  If I use mplayer to play a
> file I get 2 channel PCM sound output using the default settings, but
> with -ac hwac3 I get 5.1 channel Dolby Digital on my stereo receiver
> (which is hooked in to my mythtv's optical spdif port) and it sounds
> great.
>
> If I play the same file through MythTV, with "Enable AC3 passthrough"
> turned on in the configuration, then all I get is noise.  It sounds a
> bit like a baseball card in a bicycle wheel, just a choppy clicking
> sound.  With this option turned off, I can hear the left and right
> audio channels only.  The center channel which carries most dialog is
> missing.  (I have 5.1 as the setting for max audio channels.)

i am no expert but i believe this should be set to two (or stereo?)

>
> This happens with video from multiple sources.  (DVD rips, firewire
> capture from cable box, etc.)
>
> Is anyone else on this list have success or trouble with these kinds
> of files/recordings?  Ideally, I'd like to have AC3 passthrough
> working in myth as well as it does in mplayer.
>
> Eric Sharkey
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