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Here is one explanation for you. For a more elaborate answer, you can go to the experts at alt.video.laserdisc on Usenet who have been chatting there about the format for almost 20 years.

IS A VIDEODISC SIGNAL DIGITAL?
No. The final output of a laservision videodisc is an analog NTSC standard television signal (at least in North America...other television standards, such as PAL and SECAM exist throughout the world). The SLICE OF LIFE and SLICE OF BRAIN videodiscs use the NTSC standard and thus are viewable through regular television sets. Each frame of a CAV formatted videodisc is like a still-frame from a video. These frames are not stored as individual files, such as a jpeg, gif, bmp, or pict file formats common in the computer world. They can only be recalled for playback by their individual videodisc frame numbers.
Although the content of a videodisc is encoded in pits and landings and read by a laser, in the final analysis, the laservision videodisc is like a glorified, high quality, LP record, except it plays video in addition to sounds.

Actually if you really what to get technical, NTSC standard when it comes to filmed movies are 23.976 frames per second, what they do when tranfering a filmed movie to TV broadcast and DVD is they take every fourth frame and split it into two interlaced half frames to convert the frame-rate from 23.976 fps to 29.970 frames per second.

Also, the frames of the movie itself are either I (key) frames, B frames or P frames.

You're ignorance on this subject it real glaring.

You denounce my claim that widescreen movies were an attempt to get tv viewers into theaters and then you agree with it. Whatever.

What you refuse to admit is that they were making movies WAY before there was even tv.

You're just pissed because movie makers started thinking outside the 4:3 ratio box.