LR's handling of video metadata is incomplete and buggy. Please add your vote and detailed opinion to these topics in the official Adobe feedback forum:
To John Ellis: Received an email from you today after posting a question on the Lightroom Forum. Am I sending this reply to you? The email Reply-To address is very strange. Wayne O.
Any responses to your forum post will be emailed to you as well as appear on the Web. I posted a response to your query, which is why you received an email with that response.