I am trying to add video into a iMovie project with some photos, but iMovie will not allow me to play the videos. When they downloaded, they created what seems to be two files, one with a .mov extension and one with no extension. One file is very grainy, but plays all the way through, the other is very clear, but can be choppy. I have downloaded video from my camera before, but I think I changed the setting since last time to a higher resolution, a 1920 x 1080. Can anyone help me with this? My son's birthday is Saturday and I am trying to get this completed before his party. Please help! 