[MEncoder-users] ac3 5.1 question

[Giacomo Comes]

On Tue, Jun 05, 2007 at 10:58:46PM -0700, Andriy Babiy wrote:
> > 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

This value here is the argument of -channel and default to 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

Add -v to the command line and you will see the previous information in the
output.

Giacomo

> 
> 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
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