How to change iMovie Project from iSight to DV-NTSC?

Question

I noticed my iMovie project says it's an iSight project, meaning everything will be converted to motion-JPEG's on export in full quality. But my project has both DV and MJPEG clips and I prefer to export my DV clips untouched, not converted to MJPEG. If the project was in DV-NTSC mode, DV clips would be exported untouched. (The MJPEG would be converted to DV but I don't care about that.)
How do I change the project type from iSight to DV-NTSC?

Answer 1

Yes, there is always that option. However, I want to make sure that when I export a DV clip to a DV file, it will be exported untouched. If iMovie is in MJPEG mode, I'm afraid it might convert the DV clip to MJPEG and then back to DV.
It doesn't matter now since I've figured out how to switch between iSight and DV-NTSC modes. You can't do it in the application, but you can if you edit the iMovie project file itself. Towards the end of this file look for either ISIGHT or DV-NTSC. If it's not the one you want, replace it with ISIGHT, if DV-NTSC, or DV-NTSC, if ISIGHT.
Why is it important which project type you have? I've learned that video effects like transitions and fades are done in the default format iMovie has selected for your project. So if iMovie labeled your project as iSight (MJPEG), then all of your subsequent video effects will be rendered in MJPEG. If iMovie labeled your project as DV-NTSC, video effects are rendered in DV. This is important to know because effects rendered in a clip's original format are rendered much faster and may look better than if they weren't. So if you have a DV clip you wish to apply an effect to and the project is recognized as MJPEG, rendering the effect will likely be slow and the results may look bad.
This is just another annoying quirk that I've discovered during the course of editing a project. Seems like once I've figured out all the quirks of a particular version, another comes out with a new set of quirks.