mmx, mmxext version, but only mmxext is really usable (other need a
 _lot_ of CPU power).

There are new options for ffmpeg plugins :
 --ffmpeg-pp to choose postprocessing module( c, mmx, mmext or mmx2 )
 --ffmpeg-pp-q to choose quality( 0..6 )
 --ffmpeg-db-?? ( where first ? is for y or c, and the other ? for v or h )
to force deblocking on luminance(y)/chrominance(c) horizontally or
vertically.
 --ffmpeg-dr-? ( where ? is y or c ) to force dering on ...