How do I upload videos to iMovie?

Answer 1

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As the above answer says, when you plug your camera into your computer, iMovie will open automatically and give you the option of importing the video.
Otherwise, download the video files to your computer - into a folder on your desktop perhaps or wherever, then open iMoie and click on File > Import movie.
Navigate to where you downloaded files are and import into iMovie.
Regards, Zyfert

Source(s):

http://www.apple.com/ilife/tutorials/#im…

Answer 2

Plug your camera into the computer, and an option should pop up, if you want to upload them to iPhoto. Upload them to iPhoto, then when you open iMovie, they should be there.

Source(s):

I have an iMac.

Answer 3

The video formats supported by iMovie are: MP4, M4V, MOV, AVI, 3GP. If you got a unsupported video, such as FLV, WMV, MKV, VOB, MPEG, DAT, ASF etc, use a Mac video converter, which can convert video to all Mac players and devices, to convert it to iMovie acceptable format. Some .AVI videos cannot be imported into iMovie because of incompatible encoder, you also need to convert them. .3GP format is not recommended for the quality loss of the compression.

Info above is copied from this iMovie blog:
http://macrippingdvd.wordpress.com/2009/…

Exactly what you want.
Glad to share.