Original post is here: eklausmeier.goip.de
Assume you want to download just the music of below video on Youtube, so you can listen to the music on your phone, while you are on the road.
[youtube] aHjpOzsQ9YI [/youtube]
Here are the necessary steps on the command line:
1youtube-dl www.youtube.com/watch?v=aHjpOzsQ9YI
2mv Crystallize\ -\ Lindsey\ Stirling\ \(Dubstep\ Violin\ Original\ Song\)-aHjpOzsQ9YI.mp4 LindseyStirling-Crystallize.mp4
3avconv -i LindseyStirling-Crystallize.mp4 LindseyStirling-Crystallize.mp3
[more_WP_Tag]To cut only a portion of the video use the following command (ss is start time, t is duration):
1avconv -i file.mp4 -ss 00:02:23 -t 00:09:44 file.mp3
One can use ffmpeg instead of avconv. ffmpeg was initially written by this incredible French Fabrice Bellard, who is also the author of tcc.
avconv or ffmpeg on Ubuntu do not come with MP3 support by default. Sou you have to install this by
1apt-get install libavcodec-extra-53
Here are the relevant versions involved:
1$ youtube-dl --version
22013.12.17.2
3
4$ avconv -version
5avconv version 0.8.10-4:0.8.10-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
6 built on Feb 6 2014 20:56:59 with gcc 4.6.3
7avconv 0.8.10-4:0.8.10-0ubuntu0.12.04.1
8libavutil 51. 22. 2 / 51. 22. 2
9libavcodec 53. 35. 0 / 53. 35. 0
10libavformat 53. 21. 1 / 53. 21. 1
11libavdevice 53. 2. 0 / 53. 2. 0
12libavfilter 2. 15. 0 / 2. 15. 0
13libswscale 2. 1. 0 / 2. 1. 0
14libpostproc 52. 0. 0 / 52. 0. 0
See also: superuser: How can I convert MP4 video to MP3 audio with ffmpeg?
For moving the MP3 file to my Android phone I use SSHelper, see also ssh and rsync for Android.