1ère méthode :

ffmpeg -i videofile.flv video.avi

2ème méthode :

#!/bin/sh BITRATE=1200 KEYINT=1 FPS=25 WIDTH=760 HEIGHT=576 INPUTFILE=$1 OUTPUTFILE=$2 mencoder $INPUTFILE -ffourcc DX50 -oac mp3lame -lameopts preset=standard -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=$BITRATE:autoaspect:keyint=$KEYINT:mbd=1:scplx_mask=0.1:vqmin=2:vqmax=10 -vf pp=lb,scale=$WIDTH:$HEIGHT -of avi -o $OUTPUTFILE