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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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