[mythtv-users] Struggling with DVB-T and AC3

[Kent Williams]

Ok, I tell a lie, in this particular system, I'm using the onboard
digital out, which lspci says is: 00:1f.5 Multimedia audio controller:
Intel Corp. 82801EB AC'97 Audio Controller (rev 02).

However, previously when using a motherboard without onboard sound, the
SB Live card worked the same.

It looks like Mian is also having the same troubles, as per the post to
the dev list, and no replies from anyone who has it fully working.
Doesn't look good :(

Anyways, please find my alsa.conf (from /usr/share/alsa) attached.
Neither /etc/asound.conf nor ~/.asoundrc exist.

To get this working, I did the following:
-Used the ALSA support from the 2.6.3 kernel (and enabled the intel8x0
module)
-Downloaded and compiled both alsa-lib-1.0.2 and alsa-utils-1.0.2
(nothing more than ./configure, make, make install)
-Downloaded alsa-driver-1.0.2c (didn't compile, just had to run the
snddevices script)
-ran alsamixer and set the master vol to 70%, pcm to 70%, un-muted
"IEC958 Playback AC97-SPSA", and left everything else at 0% or muted if
possible.
-enabled native ALSA support in settings.pro, compile myth and set the
output device to ALSA:iec958 (from memory, ALSA:spdif also worked)
-left the AC3 passthrough turned off.

I've followed this process for two different systems with different
motherboards and it has worked both times.

Now I get audio out the analogue outputs, which I have connected to the
TV speakers and also out of the onboard optical out, which is connecter
to the AV receiver.

....now if only I could get HD and AC3 pass through working!

-Kent

> -----Original Message-----
> From: Mark Edwards [mailto:mark at edwards.homelinux.net]
> Sent: Tuesday, 9 March 2004 2:35 PM
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] Struggling with DVB-T and AC3
> 
> Kent, can you post your asoundrc and your mixer settings? You're
certainly
> getting a lot more output than I am - My alsa1x install
> appears to work ok with xine, but is stuffed with myth and mplayer. I
am
> building stuff from cvs. I am leaning towards the mixer as
> being part of the problem.
> 
> Cheers,
> 
> Mark.
> ----- Original Message -----
> From: "Kent Williams" <kent2 at optusnet.com.au>
> To: "Discussion about mythtv" <mythtv-users at mythtv.org>
> Sent: Tuesday, March 09, 2004 12:13 AM
> Subject: RE: [mythtv-users] Struggling with DVB-T and AC3
> 
> 
> I'm keen to hear about anyone who has had success with this too,
> especially anyone around Sydney, AU.
> 
> Using ASLA:iec958 in myth, and leaving the AC3 passthrough checkbox
> unchecked, normal stereo works through the optical output. When using
an
> AC3 PID, all I get is a bunch of 'blips'. If I enable the checkbox, I
> don't get any audio on the optical output at all for stereo or AC3
> streams, although the amp does seem to show some signs of life when
> going into livetv (just a short click and nothing after that).
> 
> Using Ogle for dvd playback, 5.1 works fine through the optical
output.
> 
> I'm also using ALSA 1.x with a SB Live (not platinum), 2.6.3 kernel
and
> Myth CVS from a few weeks after the 0.14 release.
> 
> -Kent
> 
> > -----Original Message-----
> > From: Mark Edwards [mailto:mark at edwards.homelinux.net]
> > Sent: Tuesday, 9 March 2004 12:18 AM
> > To: Discussion about mythtv
> > Subject: [mythtv-users] Struggling with DVB-T and AC3
> >
> > Can anyone point me to a HOWTO in respect of getting the AC3 PID
> sending
> > digital out to my 5.1 amp? I have setup the DVB channels
> > with the channel editor, and I have put the AC3 PID in the audio
slot
> > (replaced the standard audio PID). Things seem to be going OK
> > with the normal audio PID, but not with the AC3 pid.
> >
> > I'm using ALSA 1.x libraries, EMU10K1 alsa driver (SB LIVE Platinum
> with
> > breakout box). the connector I'm using is the TOSLINK or
> > the RCA SPDIF on the breakout box. This seems to work OK with xine,
> > although mplayer doesn't seem to work at all : mpalyer ... -ac
> > hwac3 just ends up giving me a codec error.
> >
> > So, I'm putting ALSA:iec958 in the general TV settings for the audio
> > device, but I get all sorts of errors when MythTV tries to open
> > the device. Yes, I have checked the AC3 passthrough checkbox. most
of
> the
> > time - the errors relate to a sampling rate error - it's
> > asking for one value (the value in the 0.1 stream) but getting 0Hz
> back.
> > After a few goes, it completely fails to open the audio
> > device.
> >
> > If anyone has seen this sort of stuff before, please let me know.
> >
> > Cheers,
> >
> > Mark.
> 
> 
> 
> 
> 
>
------------------------------------------------------------------------
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> ------
> 
> 
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