Hi. I don't understand why every time I create a movie file with iMovie (HD 6.0.3) the video files get so huge when I try to export them? This happens with videos from either my camera or my phone. One example: A 22 minute video that I bring in from my phone in 3gp format and is only 29.5 MB, once I bring it to iMovie and edit it down to only 4 minutes, the only way that I can export it w/o seeing a huge reduction in quality, was in dv format and a whooping 835.5 MB. Why? How? It's sooo much shorter, and yet sooo much bigger? I know I'm missing something really dumb, so please be gentle.