I would double check but pretty sure we got there for 9:00am. Yes you have to watch the video and then bring the QR code that you are given on completion.
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.