[ViperZakuto]

here are some audio options i found in the manual
`-ar freq'
Set the audio sampling frequency (default = 44100 Hz).
`-ab bitrate'
Set the audio bitrate in bit/s (default = 64k).

From what i understand about this, is that it will set the video output to the same as the input file.
`-sameq'
Use same video quality as source (implies VBR).
ex
ffmpeg -i file.avi -sameq -ab 300k file.mpg

make sure to put the audio and video options before the output file and NOT the input file.

Also you can do multiple conversions at once if your computer can handle it.

ex
ffmpeg -i file1.avi -sameq -ab 300k file1.mpg -i file2.avi -sameq -ab 300k file2.mpg so on and so forth.