thank oyu for the youtube article. the thing i want to acomplish is the max quality poss for home storage. i don't really need a compact size encoding. i don't really mind about space but for example if a video with a determinate bit rate has the same quality as the video with a higher bitrate then there's no need for that higher bitrate. i wonder what bitrates do users here use for that =P
In that case, if you want to keep reasonably close to the same quality you started with, you need H.264 @ 24Mbit or 17Mbit.
If you want to keep exactly the same quality, you're going to have it be in AIC or ProRes codecs, which is going to be a far large file than the original unedited source.
There may be an AVCHD editor out there that doesn't require you to recompress the resulting file ( like MPEGStreamclip does for MPEG2 files ), but I've not seen one.
Harddrives are cheap these days... consider backing up to a rotation of haddrives or burn a bunch of DVD-Rs with the original unedited footage.
Also consider this... left in iMovie ( which converts your files to AIC ) you'll get ~20 hours of video on a 1TB drive.
If you save your unedited AVCHD video ( @24Mbit ), you can store ~ 95 hours of footage in the same 1TB.
If I were you, I wouldn't waste the time editing that footage for archive.
Now, if you're wanting to store your final finished edited piece and you want *that*, then consider leaving it in AIC. It will be better quality , but of course it will take up 4 or 5 times the space per minute.
Hope this helps