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Big Al 3D
Known Participant
April 5, 2021
Question

Flickering When Using Green Screen

  • April 5, 2021
  • 1 reply
  • 2649 views

So I'm asking for my brother who uses Premiere Pro, latest version on a 2013 Mac Pro. I will create 3D content to be incorporated with his green screen shots. He will drop my PNG files with alpha into his timeline, then layers his green screen shots of people (Ultra Key) looking at cars in a showroom. Everything looks great. Then he'll render to see how it looks. Randomly in different areas, you will see some of the clips flickering. If he renders again, it might come out perfect. It also might show flicker in different areas than before. This turns into a game of rendering and keeping your fingers crossed in hopes of no flicker so it can be exported for delivery. I am the techno-geek so I will be visiting his studio to find a solution to this problem. I know to look at the rendering engine and other GPU-related settings. Was wondering if anyone else had to deal with a similar problem.

 

Note, this issue has spanned the use of several cameras and codecs, so I'm thinking it's a setting within Premiere. He also is not familiar with After Effects, so that's not an immediate solution... yet. If you need to see the flick, I can aquire a clip and post a link here.

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1 reply

Jeff Bellune
Jeff Bellune
Legend
April 5, 2021

Two things to try:

  1. Uncheck this if it's checked:

 

2. Reading your OP, it seems the green screen shots will be composited above the 3D content? If so, nest the green screen shots into their own sequence and place that sequence above your png files. Like pre-composing in After Effects, nesting forces a render order in Pr. So the green screen footage would be rendered before being composited on top of the 3D image sequence. (Also consider rendering your 3D content without an alpha channel *if* it is supposed to be the background layer for the shot.)

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    Big Al 3DAuthor
    Known Participant
    April 5, 2021

    Thanks for your reply. I've attached a video he took of his screen. Everything in this shot is a 3D render except the people. As you can see, there are multiple layers going on here. This might help.

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    Big Al 3DAuthor
    Known Participant
    April 5, 2021

    I think the composite in linear color setting may be causing that.


    We tried turning that setting and off and didn't change anything. Do you think moving the green screen clips into their own nest will change anything? Also, since the trashcan has custom AMD GPUs, how much should I look into that?

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