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Creating slow motion with 24p: jerking problems
I recently shot a live event using 2 Sony Z1U HDV cameras and 1 Panasonic DVX 200 HD camera. Now I’m making a small piece with short clips from all three cameras and want to run them in Slow motion (about 490%). I have them in a combined timeline set to 720 by 480 NTSC DV and framerate 29.97 in the timeline (I’m using FCP Studio 2 on a G5).
The problem is that the Slow Motion of those clips shot on the Panasonic with the P2 cards (the camera operator didn’t tell me he was using 24p, apparently to save space) is kind of jerky. Actually, the P2 video clips go & slow up & go, not really a stutter or flutter.
Anyone have any ideas on what to do, how to smooth that out, or is it too late, not possible. My SloMo is out the window if this can’t be made smoother. Thanks.
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4 Replies
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Hi Mike,
Other suggestions may be using Motion and enabling Optical Flow or applying filters like Twixtor, but I’ve noticed an improvement by using some motion blur right in the clip’s motion settings tab.
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Mike
What you are seeing is waht we affectionately call “judder”. its because 24p does not go into 29.97 evenly, so certain frames are “pulled down” to make them fit. It doesnt become an issue until you do slo mo.
in short, you need to remove the 3:2 pulldown on the shot. I beleive cinema tools will do this. Once you have done that, the shot will run faster, roughtly 125% so 50% may look too fast.
for more information search the forum for “removing pulldown”
hope this helps
“I like video because its so fast!”
Bob Flood
Greer & Associates, Inc. -
Hi Joel, Thanks for the help.I’m looking into Twixtor but a little leery of putting out the money if it doesn’t do it. I like the motion blur idea and am trying it. I’ve used it before with some motion blur problems with SloMo in the 29.97 rate, however, so far no luck. I don’t have much blur, mostly a sort of stop and start. I’ll keep trying different settings. As usual, much of this is trial and error.
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Thanks, Bob, I just tried it (using Cinema Works) and seems to work. That’s encouraging. Now I have to do the slow process of selecting the clips and conforming them. I’m hoping that I won’t have to conform each individual smaller clip that I’ve cut but can apply this to an entire captured clip and it will apply it to all the smaller clips I’ve cut from from the whole captured one. Again, thanks. It seems to work.
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