The following video (https://www.youtube.com/watch?v=2WdO5WvwqeM) is very interesting because it features some effects which I think might require a framebuffer to achieve. Having a framebuffer in 1978 would to my knowledge be a very big deal.
I’m interested in how the following effects were achieved:
First of all wee see vertical mirroring of the video multiple times such as at 04:18 in the video. What’s interesting is when the effect is switch on you can see a drop in resolution. This makes me suspect that it could have been an early digital framebuffer that helped with this effect. I’m not sure how else it could have been done.
At 3:02 we can see what looks like standard video that’s been slowed down. What you’ll notice about this part of the video is that the vertical resolution has been half’ed. Did they use a framebuffer for this or maybe it’s possible with a professional VTR to play the same fields multiple times and then use it for both the odd and even fields?
At 04:49 you can see horizontal mirroring. This one would just need a line buffer but is that how they did it?