D3100 Video Question

bigmags14

New member
So when I record video on my D3100 it looks good on the camera screen. But when I put my memory card on my mac and view the video on there it looks grainy, especially when there is little light. I had to upload one of the videos to youtube and after that the grain is entirely gone and the video looks great. So why would the video look bad on my mac (using quicktime player or nikon's nx2 software) but great on youtube? BTW im using a sandisk class 10 card, 1080p @ 24 fps video mode.
 
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