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"...my belief that a CAV disc displayed one frame of film per disc rotation, so it would be going faster when it reached the outer edge..." ... no it wouldn't!... the data for a single frame of film would - in the case of a CAV disc - simply be 'spread out' over a longer (linearly speaking!)...

"Eh, NO, it's not simple, in fact I think it's just backward." ...sigh... ...with very few exceptions, ye olde 10-inch and 12-inch shellac records (ask your [great-]grandparents) 'turned' at a nominal 78rpm... ...then came 10-inch and 12-inch Long Playing records (almost immediately dubbed...

"...CLV (constant linear velocity) is not really CLV. It can't really be called CLV because it isn't constant velocity!..." ...ahh... it isn't called "constant velocity" but "constant linear velocity" ... that explains why a CLV disc (whether LD, CD or DVD) starts out at the center spinning at...

...I seem to recall that at one time there were (a very few?) LDs featuring anamorphic transfers... never saw one myself, but I do own an 'old' Pioneer LD player (plays PAL discs only, reads digital soundtracks only) the remote of which includes a 16:9 button!... . . . . . .