Application that downloads YouTube videos, then encodes them by using FFmpeg. PyTube offers a thumbnail preview of the online videos you import and arranges them in a drop-down list. GUI for various command-line tools such as ffmpeg and others. It allows you to resize, rotate, apply an external mp3 into a video, generate a 10 to 30 seconds mp3 ring tone !!

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All you need to do is install this : http://neacm.fe.up.pt/pub/getdeb/ubuntu/hardy/py/pytube_0.0.11.4~getdeb1_all.deb