• Adobe After Effects

  After Effect CC 2015 Rotobrush time offset?

  Posted by Golan Bueno on October 16, 2015 at 1:24 pm

  Hi everyone,

  I’m working on a ki-blast effect (Dragonball fan). I shoot a energy ball from my hand to a tree. The enery ball is made with Particular.

  What I did is rotobrush my hand, because I want the energy ball to be behind my hand. Everything works in After Effects, but when I export everything to a .avi or .mov file. You will notice that my rotobrushed hand doesn’t match it orginal place anymmore.

  screenshots:
  

  

  Extra info:
  Shoot with my mobile: 1920×1080 – 29,85 fps
  Because i shoot my energy ball against the tree I needed to 3d track the footage. If tried the rotobrush layer in 2d and 3d settings. Even tried to keyframe it, but that’s seem to be impossible (to much work).

  Does anyone know how to fix this or what am I doing wrong?

  Thank you,

  Golan

  Tero Ahlfors replied 10 years, 9 months ago 3 Members · 4 Replies
• 4 Replies

• 

  Tomek Dyszkiewicz

  October 16, 2015 at 5:59 pm

  I believe problem is located in framerates. Double check whether you really have 29,975 input footage and/or comp settings is the same framerate and/or export settings have the same parameters.
• 

  Golan Bueno

  October 17, 2015 at 4:55 pm

  Thank you guys for your reply.

  @Dave LaRonde: AE is giving me the number of my footage. It is straight out of my phone (.mp4). Would you suggest me exporting my footage to a .mov 25 fps? Not sure about the fps. I think it would be better than exporting it to 29.975.

  @Tomek Dyszkiewicz: I double checked them all and they all have 29.850 fps. The strange thing is in AE i don’t see any time differents with the two layers, only in my export, but its one and the same export.

  I will try and eport it to a .mov 25 fps. I will let you guys know if it worked.
  Golan
• 

  Golan Bueno

  October 18, 2015 at 5:32 pm

  Thank you guys,

  Exporting it to a .mov 25fps fix the problem. If you are curious about the end product. Here is the youtube link: https://www.youtube.com/watch?v=mP0HusVHkC8

  Golan

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• 

  Tero Ahlfors

  October 18, 2015 at 5:38 pm

  Phones usually compress the footage by using variable frame rate. It doesn’t show any weirdness when you’re viewing it but if you’re using it with a software that’s expecting a constant frame rate you’ll run into problems.

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