Dear Irish Mark
Thank you very much for your responses.
When I said that wmv is too big I mean that my 10 minute video would not have been allowed had I used wmv because it would be larger than the 100MB limit. The video was about 99MB in "Main Concept avc/acc mp4" and I think that wmv is about twice the size. That means I would only be able to upload 5 minutes in wmv. Since my videos are boring, this would be no great loss perhaps but...Too Big? Your video is almost 10 mins long so of course its gonna be large. When the video is at 1Mbps but it will be fine - it'll just take a while to upload.
Minor point, I am not sure why you say "re" (in "re-encode") because my original video was not mp4 but avi, this time now that I am using the Sony DCR VX2000 camera.The point being MP4 is a really crappie video format to re-encode.
Yes...To get the best results i suggest yuo render out a small 5 second segment and upload that. then tewak your encoding settings as appropriate to get the best results.