I'm kinda new to iMovie. And I'm having a little difficulty exporting with the best quality possible. Any help you guys can give me? My videos are going to Youtube.
Youtube does have a size limit for the videos, as well as certain resolutions that it will accept. You should be able to go the Share menu and select Youtube to do a direct upload to your Youtube account. From there, it is a seamless integration with Youtube.
After you have finished your iMovie project, click on Share > YouTube.
You will have 5 size options to upload in - Tiny, Mobile, Medium, Large and HD.
Obviously if you have shot your movie in HD then use this setting, otherwise Large will give you the best quality upload - HQ in YouTube.
However it all depends on the size that you imported your files into iMovie.
You cannot upscale - i.e. import at 640 x 480 then export at 960 x 540.
After you select a file size to upload click on the little 'i' (information) button at the right end of the line and that will show you your file size.
Size limitations: 10 mins and/or 1GB.
Regards, Zyfert