When I select from the the link to
Cocoa Beach Florida in the latest "Yesterday's new topics" the video sharpens at exactly the same point into the video clip REGARDLESS if I start at the very beginning or start just a second or two before the point where it sharpens. To me this seems to indicate that the video clip is not high res from the beginning,
Try it yourself and advise if you too notice that it 'sharpens' just at the point as per the attached screen shot which is approx 10-11 seconds from the start. Most interesting.