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IMovie Help: how to change the speed of a clip

Hey everybody I was editing some video and found out that the option of changing the speed of the clip is greyed out. Anybody know how to solve this problem? Thank You
Im using OS X Yosemite 

Toga_Dan1 year ago

i can do that in final cut...

https://support.apple.com/kb/PH2239?locale=en_US

clip may not be long enough or needs to be converted to a more useable format.