Film speed up.

[ppppenguin]

Hard to say what's done these days as all options are possible.

Shooting options:
* 24fps or 23.98fps
* 25fps
* 30fps or 29.97fps
* 50fps
* 60fps or 59.94fps

The non-integer frequencies are a legacy of the NTSC system where the H and V scan rates were lowered by 1000/1001 so that the sound subcarrier could stay put while minimising sound/chroma beat patterns. This change later caused merry hell with timecode.

The 50 and 60 options are unlikely for actual film.

Any of these can be converted to any other for transmission, more or less transparently, using framestore based converters with motion compensation. There's an advantage if your input isn't interlaced (always true with film) as it's relatively hard to de-interlace without losing something.

Traditionally 24fps film was speeded up to 25fps for 50Hz countries. The audio pitch can be compensated but it's only 2/3 of a semitone. Similarly 3:2 pulldown was used in 60Hz countries. This is a horrible process which I hope has died the death. There are frame rate converters that can detect the 3:2 cadence and undo the damage.