Extract Audio .MP3 from Flash Videos in Linux with FFMPEG

Extract .mp3 music/audio from .mp4/flv flash videos using FFMPEG:
(like files from youtube)

$ ffmpeg -i input.flv -ab 128 -ar 44100 nodame_theme.mp3

/or

$ ffmpeg -i input.mp4 -ab 128 -ar 44100 nodame_theme.mp3

NOTES:
- where input is the flash file you want to extract the audio from,  and nodame_theme.mp3 the mp3 output file you want.
- the $ sign at the start of the command is to signify the terminal's prompt, no need to type this in.
- rename nodame_theme.mp3 to the title you want after executing the command above.