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  • Davinci rendering out artifacting around motion graphics with alpha

    Posted by Tim Neighbors on October 30, 2023 at 1:34 am

    I’m using Davinci Studio 18.6.2 build 2 and when I bring in any video file of motion graphics with alpha and drop them on the timeline they look fine on the timeline but when I render the video out of Davinci, the graphics come out with little artifacting around their borders.

    I’m not having luck finding a solution to this though I do see other users have posted about this issue in forums -with no solution offered other than “just build the graphics in Fusion”. I have tried outputting from After Effects as a QT and an AVI with alpha in both straight and premultiplied and I get the same issue on videos rendered out of Davinci. I have to use AE because i’m working with AE graphic templates so I cannot use Fusion within Davinci to create the graphics. My graphics card is NVIDIA GeForce RTX 4070, I’m working in Windows 10 64bit.

    I’m hoping I don’t have to redo all of my graphics and animations in another software since I just spent a week bringing them in and animating them in Davinci.

    Tim Neighbors replied 6 months, 3 weeks ago 3 Members · 4 Replies
  • 4 Replies
  • Michael Gissing

    October 30, 2023 at 1:50 am

    I presume you are using ProRes4444. .mov and AVI are just wrappers. Did you try changing the clip attribute alpha settings. It defaults to straight but if the clips are pre mult then you you might want to change the clip settings to see if that helps. I’ve only had jaggy edges with DNxHR444.

    The another codec choice might be png or exr image sequences then import as a sequence in Resolve so they look like a clip.

  • Tim Neighbors

    October 30, 2023 at 4:37 am

    Thanks for the suggestions. Yes, the prerendered graphics out of AE were prores 4444 XQ with alpha and V210 10-bit YUV with alpha. I’ve also since tried DNxHR/DNxHD, DNxHR RGB 444 12-bit, and a png sequence. I’ve tried rendering the graphics out of AE in different color spaces (Rec.709 Gamma 2.4 and sRGB IEC61966-2.1). All of them have more or less the same result, with speckles around the edges of the graphics. Here’s an example:
    https://drive.google.com/file/d/1DPnWC3N7MG4sdJQXujQkXX0sx4scfQVS/view?usp=sharing

    One note is that when I render out of Davinci as 4K rather than HD, the speckles/artifacting are much less noticable, but still unacceptable. Hopefully that’s a clue.

  • Riccardo Luppi

    October 30, 2023 at 6:45 am

    Have you tried to change the resampling filter to Mitchell or Lanchzos?

  • Tim Neighbors

    October 30, 2023 at 6:31 pm

    I think my problem may be solved! Not sure if this is more or less what you were saying Riccardo, but in search for the preference you mentioned, I went to Project Settings/Image Scaling/ and changed Resize filter to “Bilinear” and checked the box to “Override output scaling”, and I was able to render a clean output.

    Thanks Riccardo!

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