Cubase 7.5 and iPhone 5 video

I have to do a voiceover for a movie shot on an iPhone 5. I knocked down to 720 for performance; and I get a project/video frame rate mismatch message in red. I tried “Get frame rate from video” and it doesn’t work. Other preset settings don’t work either. The video is 29.98 fps. What should I do? It’s only a voice over, but I don’t want problems later. Thanks.