On Mon, 22 Feb 2010 20:48:46 -0600 James Hastings-Trew <jimht at shaw.ca> wrote: > > How can I keep the 4:3 aspect ratio? > > > > > -vf scale:720:540 540 is not a multiple of 16. You should NOT encode videos with it. Scale up/down, or crop down to %16==0. -- Ha. I'm the idiot.