Line + Round Caps + Trim Paths + Motion blur = Ghosting Artifact

Motion blur and trim paths has has this issue for YEARS, so I have little hope that it will be fixed any time soon....

Thanks for the reply John!

Looking forward to seeing your next message when its in the beta build!

Much love,

Dierenwinkel

Hi @Dierenwinkel Doc,

Thank you for your patience as we're continuing our investigation. The issue has been filed and assigned, but there is not yet a fix in place. I'll be sure to keep this thread updated once a fix is available in the Beta builds.

Cheers,

- John, After Effects Engineering Team 

Hey John,

Any info on when this bug will be fixed?

I encountered the issue again in a quite nessisary asset we use for our company. 

Much love,

Dierenwinkel

Hi since the reply button is still broken I will do it this way. Sorry for giving u guys extra work but this is the only way to communicate for me atm.

@JohnColombo17100380 

The bug is really really weird. So when I reopened the project I didn't get the bug but I got the correct behavior. With a round cap!

Now change the round cap to butt cap in your project and it will have the bug.

It's gone if you reopen the project.

https://i.gyazo.com/72fe249b7134b34b410481a7387e0279.mp4

Here is a gif of the issue in action.

Hopefully this also works on your end.

M1 Max, AE 23.0.0

Much love,

Dierenwinkel

Hi @Dierenwinkel Doc,

Thanks for making this report. To be honest, the gif and project file you've shared both appear to show Motion Blur behaving as it's expected to by blending previous and upcoming frames together. In the project file, I don't see quite the same issue as in the gif: once the time reaches the second keyframe on the Start property, the line is disappearing as I would expect.

Have you tried adjusting the Motion Blur settings for your composition to change the final render result?

Thanks again,

- John, After Effects Engineering Team