I have a couple of movies in iTunes that look great when I view them on my computer, but when I copy them to my new iPhone, I can't watch them: the phone complains "format not supported". How can I fix that?...

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I've been adding videos to my Apple iTunes library, but almost all of them end up with a black box as the visual image, which is less fun than box covers, like my albums have. How do I add artwork to my video files?...

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