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Why rotobrushed img sequence shows object in different position than in un-rotobrushed sequence?

Community Beginner ,
Feb 28, 2024 Feb 28, 2024

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Hi, I am noticing something a bit odd that I can't figure out.

 

I have 25 fps mp4. It is 804 frames. In AE I rotobrushed it and rendered an 804 frame EXR sequence. I also rendered the original mp4 as EXR sequence. 

 

I am just experimenting, triyng to confirm that I can solve a camera, use that solve, then add a rotobrushed image sequence to then apply compositing later on (adding object in footage to 3d environment).

 

In blender, if I have the original sequence play as camera background, then you can see that the cat is lined up with the red line. All is well.

 

But if I then use the rotobrushed img sequence as the camera background, notice how the cat is sliding all over the place, especially at the beginning.

 

In the attachments I have the playback in AE of the rotobrushed scene.  As well as playback in blender showing the disparity.

 

I can't figure out how to account for what I am observing and what might be causing it. Ideas?

 

thanks

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Community Beginner ,
Feb 28, 2024 Feb 28, 2024

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In case easier to just use youtube links, here is what I see in AE with rotobrush:

https://youtu.be/4Pk0t3d6Yxs

 

Here is how Blender sees the original sequence:

https://youtu.be/IdBUuxVEQ44

 

Here is how Blender sees the resulting rotobrushed rendered EXR sequence:

https://youtu.be/jvXyunSca8s

 

 

 

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LEGEND ,
Feb 29, 2024 Feb 29, 2024

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Looks like a framerate issue. The scene appears to run at 30 FPS, not 25 FPS.

 

Mylenium

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Community Beginner ,
Feb 29, 2024 Feb 29, 2024

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Hi, in AE and Blender everything is set to 25 fps.

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