it is very obvious to me how it works. if you understand what judder is.
Quote:
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"... or if the display refresh rate is an exact multiple of the movie frame rate", the "..." means it is an extension of the previous phrase. It would make just as much sense, or even more, if the "... or" was removed along with the "..." from the end of "only if there would be motion judder without it...". In practice this appears to be synonymous with "always" but if we ever got a perfect video clock this may change.
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it will not trigger with a 23p source at 23 hz always is even used there.