I have a camcorder hooked up to my iMac running iMovie 10.0.9. When I try to import the video, I get question marks, and then the HDD Camera clicks off the menu. How can I get the video into iMovie to edit?
Try using Mac's Image Capture (in Applications folder). Then import video to iPhoto instead of iMovie. Then iMovie will automatically import your video from iPhoto.
It's the long way around, I know, but it worked for me.
It's impossible if your trying to convert another video that's already on your computer. This is unless you get Adobe Media Encoder which costs a ton of money.