#!/bin/bash
# Found this on the interwebs, requires mencoder and FFMPEG to be installed
#   on your machine

file_out=animation_msmpeg4v2.avi
file_out2=animation_mjpeg.avi
fps=33.333
obr=2400
opt="mbd=2:keyint=132:cmp=2:subcmp=2:dia=2:mv0:last_pred=3"
codec="msmpeg4v2"

mencoder -ovc lavc -lavcopts \
vcodec=$codec:vbitrate=$obr:vpass=1:$opt:turbo -nosound -mf \
fps=$fps:type=png   -o NUL: mf://*.png

mencoder -ovc lavc -lavcopts \
vcodec=$codec:vbitrate=$obr:vpass=2:$opt -nosound -mf \
fps=$fps:type=png -o $file_out mf://*.png

rm NUL\: 

mencoder $file_out -o $file_out2 -ovc lavc -lavcopts vcodec=mjpeg