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Inspiring
July 30, 2022
Answered

Premiere Pro, Roll credits flickering/jerky

  • July 30, 2022
  • 3 replies
  • 15167 views

Hello, I am currently working on a movie for two years and finished working on the end credits. 

I realised the essential graphics roll credits is making my text laggy and jerky. How do I stop this issue?

I am using 23.976.

How do I reduce the lag? I've tried reduce-interlace-flicker and added 1.2, and make the text alittle grey to all the text. It is still showing the same issue.

This topic has been closed for replies.
Correct answer R Neil Haugen

Meant to say the problem is the jerkyness of the scrolling.


First, if your monitor isn't refreshing at either the same frequency as your sequence or double it, that can cause this. Which is why it's good to have a monitor that comes with refresh rate settings to match video work.

 

Second, IF the monitor is showing them correctly without visual jerkiness, you need to have whole-number vertical movement per frame.

 

Set your timeline timecode to Frames. Then count the length of time in frames that you want to have for your crawl.

 

Now you need to do a bit of math. Your vertical motion needs to be a multiple of the 'horizontal' motion ... the frame count. In even "whole" numbers.

 

So you have a vertical scroll ready ... and it's say 9,000 pixels total 'height'. You want a typical 3 pixels per frame movement ... so you need to set the length of that scroll on the timeline to 3,000 frames.

 

But if you want a slightly slower 2 pixels per frame vertical movement, then ... you need to adjust the 'length' or frame-count of the crawl to 4,500 pixels. Because you need an exact number of pixels in whole numbers.

 

If you can't divide your pixel height of your crawl by the speed in frames of movement, then you need to make small adjustments to your crawl to get that so that you have a whole number pixel count.

 

Neil

3 replies

R Neil Haugen
Legend
July 30, 2022

A "crawl", vertical movement for text in the end credits, is very difficult. First, you have to have the perfect timing of motion. Which is to say, no "partial" frame motion. For every frame to frame time, there must be an exact 1, 2, or at most 3 pixels of vertical motion.

 

If you divide the number of frames of the crawl by the vetical frames motion and get anything other than 1, 2, or 3 ... say you get 1.2 ... that's a problem. You need to adjust the length of time until you get exactly a full integer number, no decimal points.

 

Neil

Everyone's mileage always varies ...
Inspiring
August 1, 2022

Oh, do you mean by dividing the crawl motion to get a whole number instead? How can I find the number of frames of the crawl?

Stan Jones
Community Expert
Community Expert
August 1, 2022

Change the time display to frames. (Right click) Subtract the beginning and end frame count.

 

Stan

Peru Bob
Community Expert
Community Expert
July 30, 2022
Inspiring
July 30, 2022

I am on 15.4.1 

GTX 1050 TI

I5 8500