Hi,
Check these links.
http://www.technobuzz.net/utube-ripper-download-convert-youtube-video-in-ubuntu/
http://www.ubuntugeek.com/pytube-best-youtubegoogle-manager-downloader-and-video-converter-for-ubuntu-linux.html
http://www.miksoft.net/mobileMediaConverter.htm
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Regards,
T.Shrinivasan
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