To install XvidCap on Ubuntu 12.04 (i386), run these commands:

-sudo apt-get install imagemagick libavcodec-extra-53 mplayer
-sudo apt-get install libglade2-0
-wget -O xvidcap_1.1.7_i386.deb (ver: http://goo.gl/5yFJQ)
-sudo dpkg -i xvidcap_1.1.7_i386.deb

To install XvidCap on Ubuntu 12.04 (amd64), run these commands:

-sudo apt-get install imagemagick libavcodec-extra-53 mplayer
-sudo apt-get install libglade2-0
-wget -O xvidcap_1.1.7_amd64.deb (ver: http://goo.gl/7TkQW)
-sudo dpkg -i xvidcap_1.1.7_amd64.deb

Cheers,
Goose

1) mkdir /home/gustavo/development/youtube-manual-download
2) cd /home/gustavo/development/youtube-manual-download
3) sudo wget –no-check-certificate https://yt-dl.org/downloads/2014.03.18.1/youtube-dl -O /usr/local/bin/youtube-dl
4) sudo chmod a+x /usr/local/bin/youtube-dl
5) youtube-dl https://www.youtube.com/watch?v=0KSOMA3QBU0

Listo !!!

A mi me ha funcionado:
ffmpeg -i xyz.flv -y -an -sameq -r 3 -f image2 -vcodec mjpeg thumbs/img%03d.jpg

Paree que pronto habrá queusar:
avconv

Cheers,
Goose

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