[MEncoder-users] Using HRTF in Mencoder?

[Nico Sabbi]

Walter Belhaven wrote:

>Hi,
>
>What's the proper way to "downmix" an AC3 DD 5.1 soundtrack to stereo,
>taking advantage of the HRTF audio filter, for use with, say, a
>portable video device?  I'd like to take the movie with me and play it
>back using my video device, and I really like how HRTF sounds in
>headphones when fed a DD 5.1 soundtrack.  That's, of course, when
>listening on my PC and using mplayer; but, for some strange reason, my
>video device doesn't have mplayer on it. :)
>
>So, in the process of transcoding/shrinking the video, I'd like to
>transcode the AC3 5.1 audio to 2 channel (e.g., AC3 2.0) using hrtf.  I
>imagine I need to use the pan filter in conjunction with hrtf, but I
>don't quite understand how these two work with each other, if at all. 
>I'd appreciate any help you folks can give me.
>
>Cheers,
>WB
>  
>
to my ear + earset the best sound is the one produced by
-channels 6 -af pan=2:1:0:0:1:1:0:0:1:1:1:1:1
without hrtf (that downmixes itself, so it doesn't need pan).

That pan copies the full bass and center to both channels.