Sony Vegas: Audio but no video from iPhone?

I recorded multiple clips from my iPhone 4s and imported them, edited them and completed my movie although when I render the video into any format it only plays my title and maybe the first clip (only in quicktime) and then the rest of the film is in black with only audio playing in the background. What can I do to render it and play it completely? I'm currently using Sony Vegas 12.

Drive a '73 Oldsmobile, then get back to me.

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