Looking for an open source software to download video in youtube? Getting tired of console-based application like youtube-dl,mencoder,etc? Or maybe too busy to understand all command to download and convert video? Now, you don’t have to worry about that. PyTube comes to save your life.
Taken from ubuntugeek :
PyTube offers many features using top quality OpenSource tools such as GTK+ for smooth user interface, ffmpeg/mencoder/sox for format conversion and the easeness of the Python programming language to implement new features in a matter of minutes. PyTube offers the following features:
- Easy GUI
- Multimedia file conversion ( OGM, OGG, OGV, MP3, MPEG, AMV, GIF, MP4, WAV, AVI, 3GP, FLV)
- Integrated search for YouTube Videos
- Ability to download flagged videos from YouTube using a registered account
- Ability to transfer videos currently being played using Flash towards your desktop ( Linux only )
- Ability to download an unlimited quanitity of videos from YouTube, MyspaceTV, Google Video and Metacafe
- Preconfigured devices support for fast video compability on your device ( Apple iPods, Sony PSP, Flip Mino,Others to come )
- Editing tools such as video rotation, video scaling, inserting a custom audio file into a video file, video merging, cellphone ringtone generator.
- Retrieve profile information and contacts from YouTube members
- Share your favorite videos by exporting a list of video links, or import a list from another user with a few clicks
- Crossplatform Code
Unfortunately, PyTube package doesn’t exist in Ubuntu repository. So you must download it from another site like getdeb. And then install it using dpkg -i pytube_0.0.11.4~getdeb1_all.deb. Don’t forget to run that command as root, otherwise your linux pc will scold you. 
. Oh, FYI, PyTube doesn’t support using proxy. So, you must have direct connection to get this application working properly.
Note: This application requires ffmpeg compiled with mp4 and 3gp support wich can be found on the Medibuntu repository.
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