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

[Fredrik Eriksson]

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?
>
> Thanks in advance 
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>   
Hello

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.

--
Fredrik Eriksson