On 06/01/2021 20:20, Joe wrote:
> For filming, but it was never displayed at that rate. In 50Hz countries,
> telecines and cinema projectors had a double shutter to display each
> frame twice (though no interpolation)

They actually played it 4% faster at 25fps and then doubled it to 50fps.

> and NTSC telecines repeated alternately 2/3 times to get it up to 60.

Which gives the correct speed, but terrible tearing of movement when
different film frames are used for each field of an interlaced TV frame.
Luckily not something you see any more with progressive formats.

---druck

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