#mencoder mf://*.png -mf w=800:h=600:fps=2:type=png -ovc lavc \ -lavcopts vcodec=mpeg4:mgb=2:trell -oac copy -o ftle.avi
mencoder mf://*.$3 -mf w=800:h=600:fps=$1:type=$3 -ovc lavc \ -lavcopts vcodec=msmpeg4:mgb=2:trell -oac copy -o $2