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twixtor stop and start problem

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Mike Hoolboom
twixtor stop and start problem
on Nov 21, 2013 at 4:24:10 pm

i am working with super 8 footage, transferred to apple pro res 422 hq 23.98fps,
when i apply twixtor the slomo rolls smooth for a couple of seconds, then pauses for a few frames,
then repeats these interuptions. any way to get rid of the stoppings?


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Pierre Jasmin
Re: twixtor stop and start problem
on Nov 21, 2013 at 9:12:49 pm

Twixtor in what application?
This is a symptom of frame rate mismatch somewhere

Pierre



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Mike Hoolboom
Re: twixtor stop and start problem
on Nov 21, 2013 at 11:14:33 pm

i'm running final cut 7.03. the twixtored slo mo is perfect and smooth, but very regularly there is a pause in the image, and then the slo mo starts again. i'm guessing the problem has something to do with frame rates of the original material, unsure what to look at to fix.


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Lori Freitag
Re: twixtor stop and start problem
on Nov 21, 2013 at 11:55:25 pm

You can watch this tutorial. http://library.creativecow.net/freitag_lori/twixtor-fcp-frc/1


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Mike Hoolboom
Re: twixtor stop and start problem
on Nov 22, 2013 at 12:10:56 am

hi thanks the for tutorial, i can see how that can be so helpful.
but i think my problem is that the original super 8 footage was shot at 18fps,
then transferred at 23.98 fps. so the digital files i have are at 23.98, but in order
to pack 18 into 24, every third frame was doubled, so when i apply twixtor, this causes pauses.
unsure how to deal with this...
would be grateful to receive any ideas you might have


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Pierre Jasmin
Re: twixtor stop and start problem
on Nov 22, 2013 at 2:55:41 am

If you advance frame by frame and you see you have a regular pattern like:
1-2-3-3-4-5-6-6-7-8-9-9
What you can do is set Twixtor Interp Mode to Nearest, and Motion Vecors to No Motion Vectors, and speed to 133.3333% (4/3).
This will remove one of every 4 frames.
make it 1-2-3-4-5-6-7-8-9

So, because you might be off by one frame (to arrive at the duplicated frame) you can create a nested sequence of the clip, and apply Twixtor to the main (parent) sequence. Then if you are off you can just slide the clip a frame at a time until you hit the right beat.

The net result will be a movie 1/4 less duration. From there it's normal Twixtor slowmo (75% speed). This will require double nesting or a first pass render that you reload.

Pierre



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Mike Hoolboom
Re: twixtor stop and start problem
on Nov 22, 2013 at 2:45:48 pm

thanks for this amazing post.
i don't know how you came up with this fantastically creative solution,
but it's great!


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