It’s installed by default in Ubuntu 9.04 and works fabulously!
Totem Movie Player now includes a plug-in for searching and playing You Tube videos without leaving the player and without Flash.
Click Applications > Sound & Video and select Movie Player (to play Totem Movie Player)
Then enable Youtube .
Click on Edit > Plugins (in Totem Movie Player)
place a check in the box labeled ‘YouTube browser‘ .
Click Close to save changes.
The You Tube browser runs in Totem’s sidebar.
If the sidebar isn’t open press F9 to enable Sidebar in Totem player.
Click the sidebar’s drop-down box to select the You Tube view.
It takes a minute for the plug-in to load search results.
When using the GStreamer backend, you can install multiple plug-in packages.
the basic and essential plug-ins for GStreamer
the plug-ins for most Open formats
good-quality plug-ins that might pose distribution problems, needed for DVD playback
a set of plug-ins that need more work, needed for YouTube videos
FFmpeg-based plug-in, contains all the basic decoders for popular codecs, such as DivX and WMV
After installing the appropriate plug-in you can enjoy playing You Tube Videos in your desktop.
You can download youtubeh264.tar.gz and install this plugin to watch youtube clips in h264 quality!