Ever wanted to download music videos from YouTube, then extract the music component from the video and convert to MP3? Well here's how to do it!
Firstly, to download the videos from YouTube, you will need to install the Flashgot extension into your Firefox web browser. This will add a small icon at the bottom right of the browser, and when it detects video (such as when you go to YouTube), you will be able to click on the icon and the video is grabbed and (in my instance) saved to the /tmp directory.
To extract and convert to MP3 we need to use the Linux command line ffmpeg utility.
The example below shows that I have moved the target file to a directory for that artiste; in this instance it is the rather shouty Charice. Maybe I should have chosen a more uber trendy yet obscure band so I come over as hip and cool
ffmpeg -i infile -acodec libmp3lame -ac 2 -ab 256k -vn -y outfile
badzilla@laptop4:~/Music/Charice> ffmpeg -i Charice_* -acodec libmp3lame -ac 2 -ab 256k -vn -y "Charice - Pyramid.mp3" FFmpeg version SVN-r25320, Copyright (c) 2000-2010 the FFmpeg developers built on Oct 14 2010 17:24:48 with gcc 4.5.0 20100604 [gcc-4_5-branch revision 160292] configuration: --shlibdir=/usr/lib --prefix=/usr --mandir=/usr/share/man --libdir=/usr/lib --enable-shared --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libxvid --enable-postproc --enable-gpl --enable-x11grab --extra-cflags='-fomit-frame-pointer -fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gsm' --enable-libschroedinger --enable-libdirac --enable-libgsm --enable-avfilter --enable-libvpx --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libdc1394 --enable-pthreads libavutil 50.32. 0 / 50.32. 0 libavcore 0. 9. 0 / 0. 9. 0 libavcodec 52.92. 0 / 52.92. 0 libavformat 52.79. 0 / 52.79. 0 libavdevice 52. 2. 2 / 52. 2. 2 libavfilter 1.48. 0 / 1.48. 0 libswscale 0.12. 0 / 0.12. 0 libpostproc 51. 2. 0 / 51. 2. 0 [flv @ 0x807dc30] Estimating duration from bitrate, this may be inaccurate Seems stream 0 codec frame rate differs from container frame rate: 47.95 (5994/125) -> 24.00 (24/1) Input #0, flv, from 'Charice___Pyramid__featuring_Iyaz___Video.flv': Metadata: duration : 247 starttime : 0 totalduration : 247 width : 640 height : 360 videodatarate : 788 audiodatarate : 65 totaldatarate : 857 framerate : 24 bytelength : 26474918 canseekontime : true sourcedata : B4A7D6941HH1287223136868392 purl : pmsg : Duration: 00:04:06.66, start: 0.000000, bitrate: 873 kb/s Stream #0.0: Video: h264, yuv420p, 640x360 [PAR 1:1 DAR 16:9], 806 kb/s, 24 tbr, 1k tbn, 47.95 tbc Stream #0.1: Audio: aac, 22050 Hz, stereo, s16, 66 kb/s Output #0, mp3, to 'Charice - Pyramid.mp3': Metadata: TSSE : Lavf52.79.0 Stream #0.0: Audio: libmp3lame, 22050 Hz, stereo, s16, 256 kb/s Stream mapping: Stream #0.1 -> #0.0 Press [q] to stop encoding size= 4830kB time=247.30 bitrate= 160.0kbits/s video:0kB audio:4830kB global headers:0kB muxing overhead 0.000667% badzilla@laptop4:~/Music/Charice> ls -lash total 31M 4.0K drwxr-xr-x 2 badzilla users 4.0K 2010-10-16 12:01 . 4.0K drwxr-xr-x 55 badzilla users 4.0K 2010-10-16 11:23 .. 26M -rw-r--r-- 1 badzilla users 26M 2010-04-14 22:05 Charice___Pyramid__featuring_Iyaz___Video.flv 4.8M -rw-r--r-- 1 badzilla users 4.8M 2010-10-16 12:01 Charice - Pyramid.mp3 badzilla@laptop4:~/Music/Charice>
The original command may be lost in that little lot, so here we have it:
ffmpeg -i Charice_* -acodec libmp3lame -ac 2 -ab 256k -vn -y "Charice - Pyramid.mp3"
Or, more appropriately:
ffmpeg -i infile -acodec libmp3lame -ac 2 -ab 256k -vn -y outfile
Here we can see the MP3 file has been created and weighs in at 4.8MB. To check out everything is ok, use the mediainfo utility
badzilla@laptop4:~/Music/Charice> mediainfo "Charice - Pyramid.mp3" General Complete name : Charice - Pyramid.mp3 Format : MPEG Audio File size : 4.72 MiB Duration : 4mn 7s Overall bit rate : 160 Kbps Writing library : LAME3.98.4 Encoding settings : Lavf52.79.0 Audio Format : MPEG Audio Format version : Version 2 Format profile : Layer 3 Format_Settings_Mode : Joint stereo Format_Settings_ModeExtension : MS Stereo Duration : 4mn 7s Bit rate mode : Constant Bit rate : 160 Kbps Channel(s) : 2 channels Sampling rate : 22.05 KHz Stream size : 4.72 MiB (100%) Writing library : LAME3.98.4 badzilla@laptop4:~/Music/Charice>
WARNING: library configuration mismatch
ffmpeg: relocation error: ffmpeg: symbol av_strerror, version LIBAVUTIL_50 not defined in file libavutil.so.50 with link time reference
ffmpeg: relocation error: ffmpeg: symbol avcodec_get_context_defaults3, version LIBAVCODEC_52 not defined in file libavcodec.so.52 with link time reference
