Convert FLV video to MP3 audio

Many times we download a song we like from YouTube, or other sites, as a FLV video. But how to convert it to a regulare audio-only MP3 file? Here is a nice solution I found on the net, using FFMPEG.

The syntax of the command is:

ffmpeg [[infile options][-i infile]]... {[outfile options] outfile}

So, to convert a flv video to mp3, we could use something like:

$ ffmpeg -i filename.flv -acodec mp3 -ac 2 -ab 128 -vn -y filename.mp3

Explanation of options

-i filename
Specifies the input file name
-ac 2
Specifies the number of audio channels to ...

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