YouTube Channel Feed – format issues

Perhaps slightly off topic, but others may struggling with the same issues as me. I’ve getting mix results with youtube channels, and I’m having trouble sorting out how to form the URL. How can I reliably grab the feed with the HTML 5 player embedded in the post, and if there a way to control the dimensions of the video player?

Here’s a sample:
http://gdata.youtube.com/feeds/base/users/youtube/uploads?alt=rss&v=2&orderby=published&format=6,5

Thanks for the support

http://wordpress.org/extend/plugins/feedwordpress/