Iphone Videos Not Rendering In iMovie

The message is saying that there is some corruption in the file. The normal way to identify and remove the corrupt frame is to expand out the timeline with the slider above and to the right of the timeline, and slowly scroll through, looking for black frames, white flashes, artifacts, and any other signs of corruption. Cut out any that you find and try to export again. You've said that you tried cutting out black frames without success, but to cover the bases I wanted to describe the method.

If still no success, you can try deleting preferences, as that sometimes cures export problems. Open iMovie while holding down the Option and Command keys and select to delete preferences in the box that appears. iMovie will open in a new library. Reopen your old library to get back to your projects.  Deleting preferences is a safe procedure that will not cause data loss or disruption to your project.

Also, you can try creating a new library, copying your project into it, and then try to export and see if it works.

-- Rich

All else failing, try contacting Apple Support.  The techs there have the capability of remotely accessing your computer that we cannot do here.  To contact apple support click on the Contact Support item in the upper right hand corner of this forum’s screen.  Navigate to a place where you can enter your phone number.

-- Rich