[FFmpeg-user] Preserving perceived loudness when downmixing audio from 5.1 AC3 to stereo AAC

Nicolas George nicolas.george at normalesup.org
Wed Aug 7 20:02:25 CEST 2013

Le decadi 20 thermidor, an CCXXI, Andy Furniss a écrit :
> Yea, but if the codec does, then maybe the code could try to do the
> best for the user that requested stereo by using it. The user may
> not know the inner workings of every codec, but the code can.

Oh, I see. It can not currently work: decoding and filtering are completely
separate processes. There is currently no API to query a codec to know the
channel layouts it can produce natively.

> Of course dca should be exempt until it's fixed, but that should be
> for another thread/further analysis :-)

Is there a trac ticket?


  Nicolas George
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