Better quality resolution for thumbnails?

Youtube and other provide this “thumbnails” to small video previews. AFAIK I they don’t provide images in higher resolution, so there is nothing I could to on my end. Looks cool what your did there, but thumbnails were never intended by me to be that big.

On the fake they to work for providers that are NOT youtube, vimeo, blip, ??dailymotion, because for them there is no need to fake anything as they provide native thumbnail images.