iMovie ’11 can smoothly import video from camcorders, but with so many digital still cameras now shooting video as well, why doesn't the application recognize those clips, too? Over at Macworld, Jeff Carlson reveals how to bypass iPhoto and import movies directly into iMovie. follow link
Turn Off Filename Extension Warning
In Leopard, Apple fixed an annoying aspect of working with the Finder in Tiger. Previously, if you changed a file's extension, the Finder prompted for confirmation. But since no one has ever accidentally changed a filename extension, Apple thankfully added an option to turn that warning off in the Leopard Finder's preferences. Choose Finder > Preferences, and in the Advanced screen, deselect Show Warning Before Changing an Extension.
Import Camera Videos Directly into iMovie ’11