Mp4 files are black

Hi,
I have some mp4 files that were created from an iPhone that were supplied to me. I can see them fine in QuickTime.
when I import them in to FCP, the video is black.
is there a way to fix this, or do they need to supply me with something different? If so, what do I tell them?
thanks,
Dave

Use MPEG Streamclip from Squared 5 (free software) to convert the media to something like ProRes 422, then import into FCP X.
MPEG Streamclip can cope with many codecs.
Andy

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