I have a 4/3 Mini DV video camera that has a 16:9 mode. Of course it shoots 4/3 and simply applies black bars above and below but it's messing up output. Programs get confused and end up squeezing my video since the 'actual' video info identifies itself as 4/3. Seeing how I can overcome that without constantly messing with program settings. Most specifically it's youtube that gets confused and squeezes my perfectly fine 16:9 video lol Thanks edit: it didn't fully answer my question but at least now I can get youtube to display my video properly. Add 'yt:stretch=16:9' to the keyword tag area and it'll stretch the video back out. http://www.google.com/support/youtube/bin/answer.py?hl=en&answer=146402 additional info about formats: http://www.google.com/support/forum/p/youtube/thread?tid=5c79de92d328bb27&hl=en .