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mencoder -ovc frameno -o frameno.avi -oac mp3lame -af resample=22050:0:3 -srate 22050 -lameopts cbr:br=80 emtrada.avi

mencoder entrada.avi -o /dev/null -ovc lavc -oac copy -lavcopts vcodec=mpeg2video:mbd=2:vlelim=-4:vcelim=9:lumi_mask=0.05:dark_mask=0.01:vbitrate=3796:vpass=1 -noskip -vop scale=320:-3,pp=hb/vb/dr/al/lb -subcp iso8859-1 -of mpeg

mencoder entrada.avi -o saida.mpg -ovc lavc -oac copy-lavcopts vcodec=mpeg2video:mbd=2:vlelim=-4:vcelim=9:lumi_mask=0.05:dark_mask=0.01:vbitrate=3796:vpass=2 -noskip -vop scale=320:-3,pp=hb/vb/dr/al/lb -subcp iso8859-1 -of mpeg

Video stream:  789.932 kbit/s  (98741 bps)  size: 27335604 bytes  276.840 secs  6923 frames
Audio stream:   80.000 kbit/s  (10000 bps)  size: 2772500 bytes  277.250 secs