We hay, nice one Mr & Mrs Hurtle. See your getting lower and faster doing 'Gordie's Gully' on Ullock, nice.
When you go to publish the movie scroll down the other options menu and you will find the publish in HD settings (750 does the job fine) rather then the AVI setting your currently using. This will make the finsihed video run as a HD and Youtube will recognise it and publish it in HD.
Keep em coming and call me next time your out to play.