mencoder -of mpeg -sws 0 -ofps 30000/1001 -vf scale=320:240::: -ovc lavc -lavcopts vcodec=mpeg1video:vme=4:mbd=1:vbitrate=400:vmax_b_frames=3:vqdiff=3 original.avi -loadidx  -ss 0 -frames 60951 -o saida.mpeg -oac lavc -lavcopts acodec=mp2:abitrate=64