Jerky movements in Flash

Posted on 2008-10-14
Last Modified: 2012-08-13
I'm noticing more and more how jerky the motion looks in Flash. Take a look at this file to see what I mean:   The red square makes it look really obvious and awful but I notice the same thing with all movement.  This file is at 24 fps, but it's noticeabl even at 120 fps.
I'm using Flash CS3.  Could there be something wrong with my version or my computer?

Thanks, John
Question by:gabrielPennyback
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LVL 15

Expert Comment

ID: 22715556
it's jerky on mine too.. it's probably being scrolled via code and the x coordinate is being incremented by a large number, such as 50, so even at 120fps, it's still jumping 50 pixels per movement, hence, jerky.

Author Comment

ID: 22716609
There's no code in my SWF,  just a tween on the timeline.  Do you have any examples of smooth motion for which you could send me a link to the FLA file?  

LVL 15

Expert Comment

ID: 22716708
It might also be the distance it has to travel and the time it has to do it in which causes the larger "jumps" on each frame. I'll make a small animation with a given distance to travel and plenty of time to do it, it should be smooth.
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LVL 15

Accepted Solution

MMDeveloper earned 500 total points
ID: 22716768

I can replicate the jerkyness on command..

The top movie is 40 frames per second, and the movie is 100 frames long (movie is 2.5 seconds long)

The 2nd movie is 20 frames per second and 20 frames long (one second movie)

the bottom movie is 40 frames per second and 200 frames long (5 second movie)

in each movie, the  box covers the same distance. It's all a matter of the framerate and how much time it has to cover the distance. The flash player does the math to calculate how much of a "jump" for the box to make on each frame to accomplish the distance given the speed and time limit.

Author Comment

ID: 22723427
RE: ... and the x coordinate is being incremented by a large number, such as 50 ...

This is intriguing. Since I'm not using code, hoe would I set the x coordinate?  Better still how what would the AS look like that would produce the same rolling ball?  If that requires more than two minutes to figure out, let me know and I'll post a new question.

Thanks again.


LVL 15

Expert Comment

ID: 22730255
You'd just need to give it more time to make the move. Set the last frame further down the timeline. It will slow it down but it will also smooth it out.

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