How to speed up iMovie

You can import the raw video through whatever means you like, and utilize Handbrake ([enter link description here][1]) to transcode it to mp4 format, which iMovie can use. This way, you can make use of the H.264 codec to encode your 1080i videos, retaining full quality, and compressing them better than Apple's compression schemes. Personally, however, as one video guy to another, if you're going to deal with a lot of HD, just shell out the cash for a bigger drive, like an external or something. It'll save you headaches in the long run, trust me.

Good luck and happy transcoding!

Don't forget the built-in Automator actions for encoding. The video plugin is very nice and has pre-sets starting with 480p (VGA size) and up.

The Encode for: Greater compatibility toggle keeps the audio and video at a lower bit rate. Depending on what your tolerance for "less degradation" is, you might experiment with Higher quality if you see too many H.264 artifacts on the default setting. It's unlikely as the encoder has a lot of room with 1.5 Mbps as the ceiling for the video data rate.

You could set up a few services to test the various settings and then make a folder action to apply your favorite encode setting to anything you drop in that folder.

Automation is fun—you might even be able to set up a folder action to do your uploading as part of this process.