As for CED, there's a pretty good history of it here
https://www.youtube.com/watch?v=PnpX8d8zRIA&t=64s
https://www.youtube.com/watch?v=mSFwyM2L5h4&t=493s
https://www.youtube.com/watch?v=hpwL...LZ7SOU&index=3
https://www.youtube.com/watch?v=P1dD...LZ7SOU&index=4
https://www.youtube.com/watch?v=ASuo...LZ7SOU&index=5
I heard that RCA dropped 2/3 of a billion dollars on this thing.
I had a player and some discs, the video resolution was about 3 MHz, vs VHS which did about 2 MHz. However, and this was a big one, any impurities on or in the disc plastic would cause skipping severe enough to ruin playback.