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It's very good yes. I recommend it to anyone with an older Mac or that just wants to lower CPU use to watch youtube.
 
Didn't work for me on Saturday. Did YouTube change their URLs again? Can anyone confirm a known working version on Leopard?
 
try to play it on the quicktime player setting.
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Version 3.0.7 is the latest as of July 10th

It works on powerpc and intel, 10.4 or above.

Only for Mac OS X.
Universal binary application supported PowerPC / Intel(R) processor. (Maybe)
Mac OS X 10.4.2 or higher / Mac OS X 10.5 or higher.(Maybe)
Safari 2.0 or higher / Adobe Flash Player Plug-ins 9.0 or higher
Safari 4.0 or higher / QuickTime 7.6 or higher (for "Video Player / QuickTime Player")
 
Surely HTML5 YT is just as good? I'm guessing it's using the QuickTime backend for rendering...?
 
Surely HTML5 YT is just as good? I'm guessing it's using the QuickTime backend for rendering...?

HTML 5 uses less CPU than flash yes but MacTubes set to QT still uses about half what it does. Mactubes with QT set as the player format uses about 1/3 or less what the web flash does and half or less what even HTML 5 uses.

Even the flash version is essentially just a QT h.264 with a flash wrapper for the ads and all the other crap that gets shown overtop of the video.

To give you an idea how efficient it is in comparison my Aunt can play up to 360p with Mactubes on a B&W G3 tower upgraded to a G4 500MHz. No way she could ever do that on the site.
 
I posted this somewhere else but it still works better then mactubes for me so I will re post it here.

To get low CPU usage while watching YouTube you need to use safari and have the develop menu enabled. You enable this by going to safari preferences then the advanced tab and then check Show Develop menu in menu bar. Then open the develop menu on the top right of the screen and click user agent, then Safari iOS x.x.x - iPad. Next open a video page and If you have a little slower ppc machine make sure the HQ button is unselected below the video. Now when you watch YouTube, videos will play in QuickTime on the YouTube page and you will still be able to see comments and have a nice browsing experience. Videos should play with a very good frame rate and there should be little video stuttering. This works very good on my 1.33ghz iBook G4.
 
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