Im currently running iMovie 10.1.2 El Capitan 10.11.6. I notice with this version of iMovie it only gives you 520p 720p 1080p. I currently have old home movies that I import a while back on the older version I'm not sure which one of iMovie and they are mini DV tape. My question is what is the best way to get the best quality when I export it to a usb drive as a file for the final movie. Ive noticed the quality is not as good id rather it just be the native 480p SD but the new iMovie doesn't seem to offer that. Ive tried google but i come up with a lot of people showing how to transfer the footage from a mini DV but I have already done that and its all on a external hard drive. Thanks for the help.