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Regression: GPU Compositor animation jittering #126297

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opened 2024-08-13 20:27:48 +02:00 by Mikhail Rachinskiy · 2 comments
Mikhail Rachinskiy commented 2024-08-13 20:27:48 +02:00
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System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 860M/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 522.25

Blender Version
Broken: version: 4.3.0 Alpha, branch: main, commit date: 2024-08-12 22:42, hash: ddc9f92777cd
Worked: 4.1

Short description of error
When combining two sources of different resolution with Mix or Alpha Over nodes, animated source will jitter when using GPU compositor.

Exact steps for others to reproduce the error

  1. Open attached blend file.
  2. Use Render > Render animation (or change keyframes and look at preview).

This jitter is absent from CPU compositor.

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 860M/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 522.25 **Blender Version** Broken: version: 4.3.0 Alpha, branch: main, commit date: 2024-08-12 22:42, hash: `ddc9f92777cd` Worked: 4.1 **Short description of error** When combining two sources of different resolution with Mix or Alpha Over nodes, animated source will jitter when using GPU compositor. <video src="/attachments/5bebe1b2-26ea-4fdb-8a00-156637cf103c" title="jitter comparison.mp4" controls></video> **Exact steps for others to reproduce the error** 1. Open attached [blend file](/attachments/2e024abb-3d46-43dd-8777-e759c53f380c). 2. Use `Render` > `Render animation` (or change keyframes and look at preview). This jitter is absent from CPU compositor.
gpu jitter.blend
89 KiB
jitter comparison.mp4
1.2 MiB
Mikhail Rachinskiy added the
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 labels 2024-08-13 20:27:49 +02:00
Iliya Katushenock added the
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 labels 2024-08-13 20:31:28 +02:00
Richard Antalik added
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 labels 2024-08-14 02:12:45 +02:00
Richard Antalik changed title from GPU Compositor animation jittering to Regression: GPU Compositor animation jittering 2024-08-14 02:12:59 +02:00
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 labels 2024-08-14 02:16:11 +02:00
Richard Antalik commented 2024-08-14 02:16:26 +02:00
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CC @OmarEmaraDev

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Omar Emara commented 2024-08-14 09:14:31 +02:00
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The problem is that the GPU compositor tries to minimize blurriness due to interpolation by moving the image by half a pixel, this half a pixel might not be needed for the next frame, so the jittering happens. While the CPU compositor prefers stability and doesn't mind blurriness, as demonstrated in this frame.

This used to work better before we implemented immediate realization of transforms, because now this happens multiple times causing more jittering. But we plan to partially revert this in the near future, so this will be solved then. This is essentially the same as #125536 I believe.

The problem is that the GPU compositor tries to minimize blurriness due to interpolation by moving the image by half a pixel, this half a pixel might not be needed for the next frame, so the jittering happens. While the CPU compositor prefers stability and doesn't mind blurriness, as demonstrated in this frame. This used to work better before we implemented immediate realization of transforms, because now this happens multiple times causing more jittering. But we plan to partially revert this in the near future, so this will be solved then. This is essentially the same as #125536 I believe.
Omar Emara added
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Normal
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Severity
High
Interest
VFX & Video
 labels 2024-08-14 09:15:00 +02:00
Bart van der Braak added
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Type
Report
 labels 2024-08-14 12:52:17 +02:00
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Reference: blender/blender#126297
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