convert avi to mpeg

to convert avi files to mpeg2 - do the following

mencoder -oac lavc -ovc lavc -of mpeg -mpegopts format=dvd -vf scale=720:576,harddup \
-srate 48000 -af lavcresample=48000 \
-lavcopts vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:vbitrate=2500:keyint=15:\
acodec=ac3:abitrate=192 -ofps 25 -o your_video.mpg your_video.avi

ORIGINAL:
mencoder -oac lavc -ovc lavc -of mpeg -mpegopts format=dvd -vf scale=720:576,harddup \
-srate 48000 -af lavcresample=48000 \
-lavcopts vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:vbitrate=2500:keyint=15:aspect=16/9:\
acodec=ac3:abitrate=192 -ofps 25 -o your_video.mpg your_video.avi