Not able to watch .mp4 videos in Quick Time Player

Hi,
I have a GOPro camera where the videos are currently stored on an external hard drive. I wanted to import those videos to iPhoto, which didn't work. Then I tried importing them without using iPhoto, but when trying to watch them I get a message saying that "Quick Time Player is not able to open the video.
I find this very strange, as I already have some GoPro videos in IPhoto, which I can view just fine (in iPhoto, and outside of iPhoto). The videos are shot using the same camera.
Also; Quick Time Player is supposed to support mp4. format; so I really don't see where I did go wrong?

What format is used on the external drive?
I suspect it's the reason the files can't be played.

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Hi guys and girls,
I hope everyone is good. I was surching this forums for a while trying to find the answer. I didn't find a complete so I thought I'd post a question and hope someone could give me a complete step-by-step guide.
Here is what I'm trying to do.
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Here I am expecting some clarifications from you. Before that let you my environement.
My working environment :
Eclipse tool and added jmf jar to my project I did not do any thing more.
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1) I am not able to recognize any video/audio devices using jmf and java sound APIs on My system.
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Not able to watch .mp4 videos in Quick Time Player

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