VSE Image Strip transform jitters under extreme scaling, unlike the smooth transform strip and compositor transform node. #101211

New Issue

ahoyue · 2022-09-20T08:24:57+02:00

ahoyue commented

2022-09-20 08:24:57 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: AMD Radeon 6600M and 6700M Series ATI Technologies Inc. 4.5.13399 Core Profile Context 15.201.1151.1008

Blender Version
Broken: version: 3.2.1, branch: master, commit date: 2022-07-05 , hash: a2d59b2dac
Worked: (newest version of Blender that worked as expected)

Short description of error
VSE Image Strip transform jitters under extreme scaling, unlike the smooth transform strip and compositor transform node.
2022-11-15 18-24-31.mp4

Exact steps for others to reproduce the error

untitled.blend

Open blend file
Increase image scale

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: AMD Radeon 6600M and 6700M Series ATI Technologies Inc. 4.5.13399 Core Profile Context 15.201.1151.1008 **Blender Version** Broken: version: 3.2.1, branch: master, commit date: 2022-07-05 , hash: `a2d59b2dac` Worked: (newest version of Blender that worked as expected) **Short description of error** VSE Image Strip transform jitters under extreme scaling, unlike the smooth transform strip and compositor transform node. [2022-11-15 18-24-31.mp4](https://archive.blender.org/developer/F13918433/2022-11-15_18-24-31.mp4) **Exact steps for others to reproduce the error** ![Untitled.png](https://archive.blender.org/developer/F13918420/Untitled.png) [untitled.blend](https://archive.blender.org/developer/F13918429/untitled.blend) - Open blend file - Increase image scale

ahoyue commented

2022-09-20 08:24:57 +02:00

Added subscriber: @ahoyue

Evan Wilson commented

2022-09-20 09:33:05 +02:00

Added subscriber: @EAW

Evan Wilson commented

2022-09-20 09:33:05 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Evan Wilson commented

2022-09-20 09:33:05 +02:00

I can confirm. I seem to recall a similar report, so this might be a duplicate. I will have to check.

0001-0200.mp4
My first thought was that this might be a floating point rounding issue that might not have a widely applicable solution.
However, using the Transform node in the compositor, I am able to smoothly scale from 1.00 to 600 without any "jumping".

0001-0200.mp4
Both videos are scale:1-600 in 200 frames at 60fps.
@ahoyue I suggest using the compositor transform node as a workaround.

Tested using 3.3 release and
3.4.0 Alpha, branch: master, commit date: 2022-09-19 04:52, hash: 6b8b2c8e7f

I can confirm. I seem to recall a similar report, so this might be a duplicate. I will have to check. [0001-0200.mp4](https://archive.blender.org/developer/F13525585/0001-0200.mp4) My first thought was that this might be a floating point rounding issue that might not have a widely applicable solution. However, using the Transform node in the compositor, I am able to smoothly scale from 1.00 to 600 without any "jumping". [0001-0200.mp4](https://archive.blender.org/developer/F13525403/0001-0200.mp4) Both videos are scale:1-600 in 200 frames at 60fps. @ahoyue I suggest using the compositor transform node as a workaround. --- Tested using 3.3 release and 3.4.0 Alpha, branch: master, commit date: 2022-09-19 04:52, hash: 6b8b2c8e7f63

Evan Wilson commented

2022-09-20 09:42:21 +02:00

The VSE's transform Strip is smooth as well, so the jittering is only when using the Image Strip's built in scaling.
0001-0200.mp4

The VSE's transform Strip is smooth as well, so the jittering is only when using the Image Strip's built in scaling. [0001-0200.mp4](https://archive.blender.org/developer/F13525747/0001-0200.mp4)

Evan Wilson changed title from ~~(video editor) Image scaling result is wrong~~ to VSE Image Strip transform jitters under extreme scaling, unlike the smooth transform strip and compositor transform node.

2022-09-20 09:47:09 +02:00

Richard Antalik commented

2022-11-15 13:36:21 +01:00

Added subscriber: @iss

Richard Antalik commented

2022-11-15 13:36:21 +01:00

Makes me think of #90785. I need to update the patch and will check this report as well.

Richard Antalik commented

2022-11-15 17:02:45 +01:00

Added subscriber: @Jeroen-Bakker

Richard Antalik commented

2022-11-15 17:02:45 +01:00

Turns out I was not correct at all, the issue is float precision mainly in add_v2_v2(uv, user_data->add_x); in ScanlineProcessor::process(). There is Y "wobble" as well. I guess that double type could be used internally, but that just moves the issue further away. Also performance is in question. Will check fixes performance wise and discuss with @Jeroen-Bakker

Turns out I was not correct at all, the issue is `float` precision mainly in `add_v2_v2(uv, user_data->add_x);` in `ScanlineProcessor::process()`. There is Y "wobble" as well. I guess that `double` type could be used internally, but that just moves the issue further away. Also performance is in question. Will check fixes performance wise and discuss with @Jeroen-Bakker

blender-admin commented

2022-11-27 21:33:05 +01:00

This issue was referenced by 3a65d2f591

This issue was referenced by 3a65d2f5911cef65590c208fb8bccd5e10a4b29a

Richard Antalik commented

2022-11-27 21:42:34 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Richard Antalik closed this issue

2022-11-27 21:42:34 +01:00

Richard Antalik self-assigned this 2022-11-27 21:42:34 +01:00

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VSE Image Strip transform jitters under extreme scaling, unlike the smooth transform strip and compositor transform node. #101211