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When percolating slide shows from iphoto-11 to imovie-11, what is best format to choose for export to minimize wasted disk space and time, given that I do not want to carry any audio? I've been using QuickTime, on the theory that Apple's programs would behave best with Apple's format, but I'm beginning to wonder.

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up vote 2 down vote accepted

The H.264 codec that the QuickTime format uses is a part of MPEG-4.
To get the best results, tweak the options for MPEG4.

Go File-> Export-> Slideshow-> Custom Export-> Movie to MPEG-4-> Options...
Below is a screen cap of the options I recommend for you. You can adjust the resolution and bitrate depending on the quality you want (higher numbers = higher quality).

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