You can find many free licensed video files in Youtube. And some of them may carry really good music. Though it is easy to download the video from Youtube using a good ‘Youtube downloader’, it is sometimes hard to find a proper software to rip the audio from the video and make a good mp3 file (say, with the bit rate of your preference).

One of major issues associated with online mp3 converters is that they take a large amount of time to do the conversion. And you can’t specify the quality (exact bit rate) of the mp3 file that you want to create.

If you are using Linux it is very easy to do this. All you have to do is to install ffmpeg; which will allow you to convert your audio / video files to the format you want.

Let’s say you want to make an mp3 file from a flash (flv) file. Here is command that you need to issue:

ffmpeg -i your_file.flv -ar 44100 -ab 320 -ac 2 our_output_file.mp3

And if you want to convert that flash file (flv) to mpg file (video), then you can issue:

ffmpeg -i your_file.flv -s 460×312 -b 512 -ab 128 our_output_file.mpg 

(you may edit the input and output file names accordingly)

Thus if you are using ffmpeg, you can easily specify the quality and the specifications of the output file you want to create. And you can convert the files in a matter of few seconds.