I just got a NS-DV1080P and took a video that is about 33 minutes long. I uploaded it to my Mac, into iphoto, and when I try and play it in QuickTime, the picture is great, but it is very scratchy sounding. I have the camcorder set up to record as a .mov file as that is what is compatible with a Mac. When I plug the camcorder directly into my tv, the sound is fine. When I play it back from the camcorder, the sound is fine. Please help with what I am doing wrong and how I can fix this.
Seems you have a codec issue! Either the codecs are out of date, in which case I advise you to update them (there should be an option for that) or check that your video memory is enough to run the file (since it may get choppy when the buffer is overloaded). Also you may want to try with a different program see if the issue persists.