[MEncoder-users] Correct routing of AC3 5.1 -> AAC 5.1 during encoding

Dominik 'Rathann' Mierzejewski dominik at rangers.eu.org
Sun Dec 16 11:12:49 CET 2007

On Saturday, 15 December 2007 at 23:43, Fredrik Eriksson wrote:
> Grozdan Nikolov wrote:
> > Hi,
> >
> > I'd like to encode the audio of a DVD from AC3 5.1 to AAC 5.1 but I don't know 
> > how to set up the correct routing so I can obtain the same channels position 
> > in the AAC audio. When I only use the -channels 6 parameter during the 
> > encoding, the channels in the AAC audio do not have the same position as the 
> > original AC3 audio. To my understanding, I'll have to use the -af channels 
> > filter but I don't get it how it works and how to set up the correct routing 
> > so I can get the same channels position in the AAC audio. Can someone provide 
> > me the -af channels option that I have to use in order to achieve this?
> unless things have changed since last time I tried the correct channels 
> filter for converting ac3->aac would be channels=0:1:1:2:2:3:3:4:4:0:5:5 
> and since mplayer (afaik) still can't handle aac channels correctly you 
> need channels=0:4:1:0:2:1:3:2:4:3:5:5 to play the file correctly in mplayer.

Current SVN does that automagically. Please run svn update and try.


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