[MPlayer-users] Incorrect HE AAC audio playback

D Richard Felker III dalias at aerifal.cx
Wed Apr 7 05:51:07 CEST 2004

On Mon, Apr 05, 2004 at 05:34:37PM -0700, Loren Merritt wrote:
> On Mon, 5 Apr 2004, Piotr Michniewski wrote:
> > Recently, I tried to open a movie in the Matroska format. It contains 5.1
> > audio in HE AAC. The audio was played, but the channels were wrong (i don't
> > have a 5.1 card). In the left speaker I heard the central channel and in the
> > right I heard one of the other channels. I think that MPlayer incorrectly
> > downmixes 5.1 AAC audio.
> 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.

-af pan works for you? How? When I try to use it, it loads 5 or 6
random conversion filters back and forth between float and int, and
white noise is the ultimate result. Very broken...


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