[MPlayer-users] RFC: docs update for "how to create a high quality DVD rip"

[D Richard Felker III]

On Wed, Jun 09, 2004 at 02:24:42PM -0500, Wayde Milas wrote:
> On Wed, 2004-06-09 at 12:53, rcooley wrote:
> > On Wed, 09 Jun 2004 11:09:35 -0400
> > Jason Tackaberry <tack at sault.org> wrote:
> > 
> > > but just because you don't have an A/V receiver for AC3
> > >         pass-through today doesn't mean you won't have one tomorrow.
> > 
> > Or, you could encode it to multi-channel Vorbis.  I'd say any reciever
> > that can do 5.1 AC3 pass-through should be able to handle
> > uncompressed 6-channel input.
> 
> Yea, how though?
> 
> I can't seem to find a multichannel vorbis encoder that works, plus you
> got the physical transport.. multichannel vorbis means you are going to
> have to use analog outs... I think. To get it down a spdif pipe you are
> going to want to use ac3 because the other end (your reciever) generally
> only understands 2 channel spdif and ac3 5.1 or 5.2 or whatever. Feeding
> it 3 or 4 or 5 channels independantly will jsut confuse it.
> 
> So you need to rencode it to ac3 5.1 on the fly. although there are libs
> to do this, I know of no code that ties it all together.

I agree this is often true, but it's a matter of stupid receiver
design. A properly designed one would accept 6 channel pcm, and in
fact only pcm. There's no point in sending compressed audio to the
receiver/speakers...it just requires more computational hardware in
them.

Rich