[mythtv-users] Not getting Dolby Prologic out of s/pdif

[Steven Adeff]

On 3/15/06, Matt <skd5aner at gmail.com> wrote:
> On 3/15/06, Steve Skarda <steveskarda at gmail.com> wrote:
> > Make sure you have use video as timebase turned off in the playback
> > settings.   Having it checked will allow digital signals to work but AC3
> > passthrough won't.   Not sure if that is related to your problem or not.
>
> It is turned off.
>
> Let me just try to quickly sum up my issue:
>
> 1) I receive HDTV OTA ATSC signal via HD5000
> 2) The first audio track says it's AC3 5.1
> 3) Receiver set to "AFD" - Auto Format Decode
> 4) When it receives the signal, the LCD on the receiver doesn't do
> anything (doesn't say what kind of signal it is receiving" and I can
> hear noice out of my left and right channels, but never the full
> signal (missing voices, etc).
> 5) If I switch the receiver to "Normal Surround" I'll get the
> channels, but the receiver NEVER says it's decoding AC3.
> 6) If I play a Standard Def recording from my PVR250/500, the receiver
> will get the signal and say it's playing a PCM signal.
>
> I think I'm going to submit a ticket, but before I do that, what else
> should I do/try/troubleshoot?
>
> Thanks!
> Matt

sounds like you don't have ALSA set up to pass AC3 signals, thus they
are being sent as stereo pcm. search the list/wiki and you should find
information on how to enable AC3 using .asoundrc

--
Steve