How do you change the format of a video?

that has already been put on your computer in your files, and is for mac os x and i want to put it in iMovie but its not showing up as clickable on the import thing how do i do this?



10 pointsss!How do you change the format of a video?
There are many downloadable software which convert movies from one format to other format, if you can specifically let me know from which format to which format you need to convert I can send link for the software.How do you change the format of a video?
what type of movie file is the movie you are trying to open in?

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