Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have posted.
I am sorry to know that you are facing problem with playing movie on i-tunes.
Let me know the movie file format, on which format is the movie file.
Do you get any codec error while playing the movie, do you hear the movie sound and no picture.
let me know the problem a bit more in detail.
These are instructions on how to find the codecs used, as well as the other specifications, of a video file using your Mac and VideoSpec.
Open the file browser and navigate the video file and let me know is it for example "movie.dmg" .dmg is the file format so let me know that.
Not a problem i would probably post few steps which you can check and let me know how it goes when you have time to perform the steps.