How to download video from Youtube and convert to mp3

To do this you need the following applications installed on your linux-box:

# sudo apt-get install youtube-dl ffmpeg sox

To download the video do this:

# youtube-dl url-to-youtube-video

To extract audio from video file, do:

# ffmpeg -i videofile -q:a 0 -map a audio.wav

To extract part of audio from wav, do:

# sox audio.wav new_audio.wav trim 00:10 04:25

(00:10 is starting position and 04:45 is the end position. This way you can trim away unwanted audio.)

To convert the wav-file to mp3, do:

# ffmpeg -i new_audio.wav -acodec libmp3lame audio.mp3

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