To convert an flv file to an mpeg file.

ffmpeg -i input.flv output.mpg

where:

• -i stands for input.
• output.mpg is the output file in mpg.

For more advanced setting, you can use the command below

ffmpeg -i input.flv -ab 56 -ar 22050 -b 500 -s 320x240 output.mpg

where:

• -ab is audio bitrate with default of 64kbps.
• -ar is audio sample-rate with default of 44100Hz.
• -b is video bitrate with delault of 2000kbps.
• -s is size with default of 160x128px.