Converting video files in linux

Converting video file format is easily done through the program ffmpeg which can be installed with a simple command : sudo apt-get install ffmpeg
after installing this just run it with different parameters. Here is an example of converting .asf file format to .avi file format:
ffmpeg -i inputfile.asf -target ntsc-vcd outputfile.avi


Another video file format converter is mencoder. Example :
''mencoder yourmovie.3gp -ovc lavc -lavcopts vcodec=msmpeg4v2 -oac mp3lame -lameopts vbr=3 -o yourmovie.avi''