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juddering/lost frames when modifying 50fps to 25fps

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Daniel Hurleyjuddering/lost frames when modifying 50fps to 25fps
by on Jun 17, 2015 at 10:00:24 pm

Hi there,

Appologies if this is covered in another post but this seems pretty specific and couldn't find anything off the cuff.

I shot a club video with a sony a7s in avchd (at 50fps 28M PS..i think). i have been modifying the clips to 25fps on a 25fps sequence. everything has been going smoothly then all of a sudden after converting the 67th clip something seems to have gone wrong and the slow motion is now very juddery. i was originally modifying each clip individually, if it was one i was going to use. then decided it was too laborious so I selected all the clips in the bin and modified all of them to 25fps. not sure if this is when they started juddering but pretty sure a few were fine after that....

all the clips prior to the 67th play fine, both in the time line and in the bin but everything after that is juddery/missing frames even though shot at 50fps.

all theories and solutions very much appreciated.



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Robert WithersRe: juddering/lost frames when modifying 50fps to 25fps
by on Jun 18, 2015 at 8:39:00 pm

This reminds me of when I imported a project into PP from FCP using the XLM files. About half the project imported, the rest was glitches. Solved by importing the second half of the timeline as a separate file.
Have you tried converting clips 1-60, then 60-120, etc?

Robert Withers

Independent/personal/avant-garde cinema, New York City

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Daniel HurleyRe: juddering/lost frames when modifying 50fps to 25fps
by on Jun 20, 2015 at 2:01:36 pm


Yeah just tried importing the files that were juddering but it hasn't made any difference. Could it be the Anthony to do with shutter speed while filming?

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