Posts whose row*Content contains a `youtube_video` block now ship a
schema.org VideoObject per video alongside the existing BlogPosting /
Event JSON-LD. Lets Google attach a video rich-result to the post URL
(thumbnail, duration where available, embed/content URLs) instead of
treating the page as plain text whose body happens to be a single
iframe.
Thumbnail uses YouTube's predictable maxresdefault + hqdefault URLs;
upload date falls back to post.created when the embed has none.
Peter Meier
7264ad6707