[MPlayer-users] Incorrect HE AAC audio playback

Loren Merritt lorenm at u.washington.edu
Tue Apr 6 21:14:22 CEST 2004

On Tue, 6 Apr 2004, Piotr Michniewski wrote:
> > Dnia wto 06. kwietnia 2004 02:34, Loren Merritt napisa³:
> > By default, MPlayer doesn't downmix at all, it just ignores extra
> > channels. To play AAC 5.1 on my stereo setup, I use:
> >
> > mplayer -af pan=6:.32:.39:.06:.17:-.17:.33:.32:.06:.39:-.17:.17:.33
> >
> > I don't know if this is the optimal matrix; I copied the coefficients
> > from MatrixMixer.
> ... and you say that is user-friendly ? :P
> But it's strange that AC3 playback on 2 channels is correct without all
> these magic spells...

liba52 has it's own downmixer. libfaad2 doesn't.
I'll see if I can use liba52's downmixer, but I don't know how much work
it will involve.

> And BTW: It doesn't work :| It only gives me about half of a second of noise
> and a grave silence...

That's a separate problem with HE-AAC. It's fixed in cvs.

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