Lineair position change not working correct

Report · Jul 08, 2023

When I move a graphic or png from position A to position B in a lineair curve, the graphic or png moves forward, then back and then forward again. Can't remember this was happing before today though I did quite some moving between keyframes in the past.

If you look at the attached sequence.mp4 you'll see what I mean. It should be a very basic lineair position change.

Premiere 23.4, Mac OS 13.4.1

Report · Jul 09, 2023

You've probably already checked this, but I find that keyframes default to Linear for temporal interpolation and Auto Bezier for spatial. If I forget to change the latter I sometimes get weird behavior similar to what you are seeing.

Report · Jul 11, 2023

I use the default setting. That is lineair interpolation. Strange thing however is that when I start with only two keyframes from A to B, the movement is lineair. But when I add another keyframe before or after A and B the movement betwee A and B suddenly isn't lineair. You can already see this in the visual curve on the screen. Depending on positions this curve sometimes even goes back and forward in a circling movement. See youtube example.

Report · Jul 12, 2023

By default only the temporal interpolation is linear. The default spatial interpolation is Auto Bezier; in the YouTube example you show, you can see this in the interpolation lines; they are not straight between keyframes but bend to form curves. Right-click on a position keyframe and open the spatial interpolation sub-menu to verify.

Having said that, I tried to recreate your problem leaving the spatial interpolation at default and moving a piece of media back and forth and was unable to. But I've definitely seen weird behavior like this before, so it's worth checking the spatial interpolation setting. If you've already set it to linear, or setting it to linear doesn't fix the issue, can you recreate the problem in a simple sequence (e.g. moving a solid color around) and upload it? Happy to try it out if so and see if the problem is limited to your system.

As a side note unrelated to your issue, scale keyframes do not have both types of interpolation; if you are doing panning AND zooming and you have both types of keyframes selected, it will only show you the temporal interpolation menu if you right-click.

Report · Jul 12, 2023

Thanks... I was not aware of the two settings, one for temporal and one for spatial. Just was looking at spatial interpolation. I recreated the sequence as you explain with both settings to lineair. This solves the issue