So now that YouTube's One Channel format is here, got any POSITIVE reaction? Personally, I like the cleaner, white look (absence of background images) so the page more closely resembles the generic YouTube search results page. It's tricky to find images that work well in this header format, but I like this solution better than uploading separate "fun size" variations for mobile. What say you?
Maybe try run through "Handbrake" before uploading. Just use source & destination encoding as same. I've found that some encoding engines don't always encode as expected. Not sure but you may want to give a try.