Why can't I watch videos taken with my iPhone on my computer?

I took some videos today with my iPhone 4s and I tried to watch them on my computer but it doesn't work. When I click on it, it just shows a black screen but I can still hear the sound. I tried to delete my quicktime and download the new version but nothing changed. I've also tried to watch the videos on iTunes but there wasn't any difference. I don't have a Mac by the way.

Try VLC player. It's free and it plays everything.

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