Converting a flv music file from youtube to mp3 with Audacity I got a bigger file than the initial flv. I guess I have set too big a bit-rate or something like that that has artificially inflated the audio file*. Or is this normal? What is the audio behind a flv?

And what is the proper setting so as to get a sound file that is the one of the "original" flv?

[*Using ffmpeg -i *.flv i got some info on the flv audio: Stream #0.1: Audio: aac, 44100 Hz, stereo, s16, 131 kb/s. While the mp3: mp3, 44100 Hz, stereo, s16, 320 kb/s]

(Installing ffmpeg and using ffmpeg -i input_file.flv output_file.mp3 I get an mp3 that is half the flv. Is this the way?)