FFMPEG can do a lot streaming, converting, also an audio – video codec library. after installing any linux distributions usually I install FFmpeg Codec library.
Download FFMPEG Here.
There is a GUI application for FFmpeg converter WinFF but I prefer using command line for converting multimedia files. it’s quite easy to use command line, you will get used to it by time.
FLV file is a container that means it might contain audio, video, text, data. Kinda like Youtube videos. but MP3 file it’s only audio file format.
Open Terminal: then type
ffmpeg -i ~/Music/88.flv ~/Desktop/88.mp3
~/Music/88.flv
is the destination for original FLV file
~/Desktop/88.mp3
is the output mp3 file destination change it as you wish.
That’s it for now.