Quicktime won't open .mov but it works on other mac computers

I filmed some footage in .mov on a JVC camera, and imported it into my macbook pro. When I tried to open it, it gave me an error saying it doesn't recognize that file. I know it's not a file problem because it opened just fine on other mac computers. Please help!

I should note that what I am seeing is really inconsistent. MOV files from some devices (e.g., a Canon DSLR) work just fine no matter which drive I put them on. MOV files created by an older version of IOS seem to work. Others, not so. And MOV files created on some cheaper cameras don't work unless on the C or D drive.

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