I have some MPEG-2 home movies that I want to edit in imovie HD, and obviously they will need to be converted. They're currently in MPEG-2 format and the container is Mpeg Program Stream. They're in 720x480, some are 4:3 and some are 16:9 aspect ratio. The only way I've found so far to copy the audio is to run them through MPEGStreamClip, which offers many options for exporting. I also discovered that if I select 720x480-NTSC for a video clip with an aspect ratio of 4:3, it comes out of MPEGStreamClip with an aspect ratio of 3:2. I can fix this by selecting 640x480, but I don't know if that's the best choice in terms of preserving quality. I haven't tried a 16x9 clip yet, but I'm assuming that I will have to choose something other than 720x480-NTSC for those as well, in order to preserve the aspect ratio. I want to preserve the quality of the original videos, as much as possible, as I intend to create DVD's to be viewed on a widescreen TV. The videos are standard definition, so I don't expect them to look like HD, just as close to the original quality as I can possibly get. Can anyone suggest which options would give me the best results? I've tried some tests with H.264 which look pretty good, but it's hard to tell how that will work overall based on one or two short clips. One thing I like about H.264 is it uses the same chroma subsampling format (YUV420p) as the original videos, so the color and brightness characteristics are preserved. Also, is it better to deinterlace before editing, after editing, or never? I've done a lot of research but haven't really found a definitive answer. Anyway, the H.264 conversion produces a clip that, according to VideoSpec, is progressive. It still seems interlaced, though, so maybe VideoSpec is giving incorrect information in this case. Another thing I'm confused about...I can import the Mpegs directly into imovie from my camcorder, and imovie will automatically convert them into the QT .mov container (with audio). However, if I copy the same Mpeg2 from my camcorder to my computer's hard drive, imovie won't allow them to be imported, they're greyed-out. That seems strange? Some of my videos are no longer on my camcorder's hard drive (it's a Sony DCR-SR100), only in my computer, so those will have to be converted. But I'm wondering if it's a good idea, in the future, to import directly into imovie as Mpeg-2's, or convert to something else first. I've read that Mpeg-2 isn't really a good format for editing. Imovie is probably converting it to something else, but I haven't figured out a way to check that. To summarize, I'm looking for suggestions regarding format, container, size, and deinterlacing. Hopefully, someone with more knowledge and experience than me can save me a lot of time...this trial and error stuff is getting old!