Using ffmpeg to encode SBS to Anaglyph

ffmpeg -i sbs.mp4 -vf mp=stereo3d -acodec copy -threads 10 -b:v 10000k -preset ultrafast -vcodec libx264 ~/test2.mkv

http://delogics.blogspot.it/2012/01/sbspolarizedstereo-3d-to-alaglyphred.html

And more good info this time using mencoder:

http://www.noah.org/wiki/Mplayer_notes