[MEncoder-users] multi-channel encoding

[Grozdan Nikolov]

On Sunday 05 August 2007 07:35, Giacomo Comes wrote:
> On Sun, Aug 05, 2007 at 04:05:37AM +0200, Grozdan Nikolov wrote:
> > Hi,
> >
> > How does one properly encode to multi-channel audio from a DVD? Say I
> > have a DVD with 5.1 channels and I want to encode the audio to AC3 but
> > with a lower bitrate preserving all channels. Do I have to use with
> > mencoder the -channels 6 option or the -af channels=6 or both?
>
> Both in this way:
> -channels 6 -af channels=6:6:0:0:4:1:1:2:2:3:3:4:5:5

Ok, what about if I want to copy all channels during encoding (no audio 
encoding, just stream copy). Is -oac copy enough or should I use 
-oac copy -channels 6 ?

btw, thanks for the help on the routing ;)

>
> The routing is necessary because mencoder (still) does not take in account
> the channel order of the specific codec.
> This channels routing is valid only if encoding from ac3 to ac3. If you do
> aac -> ac3 or dts -> ac3 the routing is different.
>
> Ciao
> Giacomo
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