> However, since it's not buffering and just playing as it streams in, and because time has slowed for those on the ship, I will posit that the video would play

> However, since it's not buffering and just playing as it streams in, and because time has slowed for those on the ship, I will posit that the video would play at relatively the normal speed to the observers on the ship as both their time and the stream itself have slowed significantly. I don't think this is correct. If you're traveling near the speed of light, light from behind you is drastically redshifted from your point of view, which implies that the wavelength is longer from your point of view. So, for example, if Earth sends out a 1 Hz signal, you'll see it at much less than 1 Hz. So it shouldn't play at normal speed. It should be slowed down.