Where it gets interesteing is laserdisc, since that IS the same size (more or less) as a 12" lP, play time is roughly 30 minutes per side, and the video signal

Where it gets interesteing is laserdisc, since that IS the same size (more or less) as a 12" lP, play time is roughly 30 minutes per side, and the video signal is full analog. The audio is analog + an optional PCM or Dolby Digital signal. Both the audio and video are FM encoded. (Yea, 30 minutes per side is long for an LP, more like 20-22 minutes is typical, but hey, it's analog. To a point you could increase playing time by deceasing volume. The most extreme case of this I'm aware of is "90 minutes with Aurthur Felder and the Boston Pops", which what it says it is... the first side alone is a hair over 47 minutes).