Hello,

I had some feedbacks on the script_upmix  :

first there was a mistake in method 3 ending in missing right channel or left right inversion.

That is fixed.

Some think method 2 is quite "loud" : nice for music, concert, musical video clip but less good for subtile dialogs and atmosphere soundtracks.

It might be useful. Attached is newer version of the script_upmix (bash script quite linux-universal)

Gérald