[MEncoder-users] ac3 5.1 question

[Andriy Babiy]

> From: "Kevin Downey" <redchin at gmail.com>
> Subject: Re: [MEncoder-users] ac3 5.1 question
>
> On 6/4/07, Andriy Babiy <ABabiy at shaw.ca> wrote:
> > Hi everybody.
> >
> > Could anyone advise me on which option should I use to build mplayer
> > to make them recognize ac3 5.1 audio?
> > Everything was OK with that; then, I rebuilt mplayer and changed some
> > options. Frankly speaking, I can't remember what exactly. Now, I have:
> >
> > +++++
> > $ mplayer -identify PosKin-1.avi
> > MPlayer 1.0rc1-3.4.6 (C) 2000-2006 MPlayer Team
> > CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (Family: 15, Model: 4,
> > Stepping: 3) CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2:
> > 1
> > Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2
[ snip ]
> >==== Opening audio decoder: [liba52] AC3 decoding with liba52
> > Using SSE optimized IMDCT transform
> > Using MMX optimized resampler
> > AUDIO: 48000 Hz, 2 ch, s16le, 384.0 kbit/25.00% (ratio: 48000->192000)
> > ID_AUDIO_BITRATE=384000
> > ID_AUDIO_RATE=48000
> > ID_AUDIO_NCH=2
> > Selected audio codec: [a52] afm: liba52 (AC3-liba52)
> > ======================================================================
>
>  -channels 6

Thanks for the reply.
But actually I meant different thing. I know I can play it 5.1 
using -channel 6 option to mplayer. My question is about recognizing the 
movie as 5.1 ac3 rather than 2 ch ac3 as it is displayed above.

Another example:
+++++
Opening audio decoder: [liba52] AC3 decoding with liba52
Using SSE optimized IMDCT transform
Using MMX optimized resampler
AUDIO: 48000 Hz, 2 ch, s16le, 448.0 kbit/29.17% (ratio: 56000->192000)
ID_AUDIO_BITRATE=448000
ID_AUDIO_RATE=48000
ID_AUDIO_NCH=2
Selected audio codec: [a52] afm: liba52 (AC3-liba52)
+++++

It's another movie, but the problem is the same.
Before I was receiving an output with the line like:

AC3: 5.1 (3f+2r+1fe) 48000 Hz 448.0 kbit/s

And I just want it back :-) Could you point me to the library I need to 
rebuild or the mplayer build option? Why are ac3 5.1 movies recognized as 
movies with 2 channel audio?
I have tried to rebuild mpalyer, several times with different options, 
without luck. Your advice is highly appreciated!

Thank you very much in advance!

Andriy