Windows 7 - USB Drive - Mac OS X

I recently and successfully installed Windows 7 onto my i7 Macbook Pro (Early 2011) via bootcamp.
While on my Windows 7/PC side, I simply copied a small mp4 video file from my desktop to my 8GB USB drive (FAT 32). If I run the file, both the video and audio run...all is perfect.
Now, when I restart and get into my Mac OS X side and copy that same file from my USB drive to my Mac's desktop and then open it from my Mac desktop, the file runs the audio, but NOT the video.
I'm at a loss for the reason for this. Any information you can provide on this issue?
Thank you in advance...

I would try the player called vlc
mp4 is just a container it's a codec so maybe quicktime don't support the codec vlc likely does however

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