Dirk Meyer <[EMAIL PROTECTED]> wrote:  "mike lewis" wrote:
> I use hwac3 in mplayer and most things sound fine. Ig uess things are
> different when mixing to six chanel out as opposed to coax or
> optical???
>
> I use my amp to decoe the ac3 and control each channels volume. That
> being said, I am not avert to a 'sound' menu to manually configure
> each chanels volume if its possible...

I always wonder if there would be some alsa setting (or something
else) that would transform a x channel sound to AC3 on-the-fly. There
is a small tool for windows doing that and it is great. You decode
AC3 in mplayer, change volumes of channels in alsa and encode it again
and it goes out. Not that I will need that, I can change each channel
volume external. But when using 5.1 ogg or Dolby ProLogic II which I
can't decode external, this would be great.


Dischi

-- 
Just remember, if the world didn't suck, we'd all fall off.
-------------------------------------------------------------------------
  Dischi, I think what you're talking about would require ffmpeg.  
   
  I want to take a moment as well to explain my current system.  I have an ECS 
motherboard with a 1.8GHz P4, 512MB RAM, BFG nVidia GeForce MX 4000, Hauppauge 
WinTV PVR 150MCE IVTV card and 280GB (total) HDD space.  I'm running a Debian 
4.0 (Etch) core, KDE window manager and use xine for practically ALL media 
play.  (Hey, I like Xine.)
   
  Xine, when configured to do so, can handle decoding 6-channel AC3.  This can 
also be accomplished on-the-fly via command line parameters.  ALSA/aRts/OSS 
must also be configured to use the audio jacks in shared mode for 6-channel 
output.  Configuring the sound subsystem to share the audio jacks when Freevo 
starts is something I have yet to work out.
   
  I do want to make this clear.  I'm NOT building an audio re-encoder; it's 
only a way to handle volume adjustments for the various channels within Freevo. 
 Currently, sixmixer.py handles adjustments from the remote while DVD's and 
such are playing.  The next generation sixmixer will have to be adjusted from a 
Settings panel.  The master volume control on the remote will then handle 
_evenly_ raising and lowering the total volume.
   
  Although I think the idea of an on-the-fly audio reencoder would be great, 
the practicalities of such a tool aren't realistic, at least not to me.  In 
math terms, X-channel_audio -> mplayer -> remixing app -> ffmpeg -> Audio_out = 
MASSIVE CPU time.  My target for development is the <2GHz PCs for conversion to 
Media Centers.  This type of audio re-encoder is WAY outside that target.  
   
  Michael


 
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