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> The encoder decides by itself what the content is.
> If it's telecined 24 fps film (a movie or prime-time
> sitcom), the encoder will detect the repeated fields
> and instead of encoding them, it just signals the
> repeated field with one bit, repeat_first_field = 1.

Another characteristic of these recordings is that the length as
reported by MythTV is quite a bit off (~50 minutes for a 1-hr
program).
-- 
Gregorio Gervasio, Jr.