Does anyone know a good source for watching/downloading launch videos (saved webcasts for example of SpaceX and NASA ). Launch videos are extremely informative especially as they are curated for the general public.
The Internet Archive has a lot of older public domain NASA material.
For example: footage from the Apollo 16mm launch cameras for various launches, all rolled into one very long slow-motion movie. These show detail of disconnection of the various support umbilicals during the launch sequence. (No sound.)