[mythtv-users] Volume problems watching live-tv (ac3 vs. stereo)
stefan.reichel at rapid-net.de
Wed May 20 18:02:52 UTC 2009
first of all thank you for your replies.
MtDean posted a patch to boost the audio volume when using ac3 by factor
3(http://svn.mythtv.org/trac/changeset/15526). I tried to apply this
patch to the current svn version by editing " libs/libavcodec/ac3dec.c".
Nevertheless the code has evolved and therefore the patch/hint couldn't
be applied by myself.
How can i achieve the suggested audio boost in the new code?
On Wed, 2009-05-20 at 16:03 +1000, Ben Coleman wrote:
> Ben Coleman wrote:
> > Whilst I went back to not having AC3 on my stereo (preamp went in for
> > repair) I had to fiddle with it and also alter mplayer settings to
> > allow 2channel normalisation.
> > This involved tweaking alsa-mixer to ensure I was downsampling to 2ch,
> > and adding oss function to the mplayer via the command line. Check out
> > alsamixer and see what options are enabled in there.
> > As I was passing AC3 through etc, and I had no decoder for AC3
> > anymore, I didn't want to play around too much with AC3 as it took
> > long enough to get it working under my scenario. I was experiencing
> > the same issue whilst my preamp was being repaired and this tweaking
> > seemed to fix the problem.
> > I'm sorry I can't be more specific but I didn't write down what I did
> > .. just remembered that I altered it through alsamixer to ensure it
> > was outputting a 2channel signal from the source.
> I have my newer preamp back and still have the same problem as the
> original poster. I use ac3 passthrough as I did with 0.20 and I have
> muffled sound for ac3 streams.
> I figure this to be either an alsa issue or mythtv configured
> inocrrectly, but am lost and interpreting what I should and should not
> do. There are settings in myth to 'use' spdif for ver 0.21. When I use
> it, it DOESN'T work. When I use default, it does work. NOTE: I am using
> SPDIF for audio output to my preamp which processes the AC3 signal.
> Can anyone suggest how to faultfind this issue?
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