Time Stretching and video texture - difference between Cycles and Eevee #116958

New Issue

Marcin Twarowski · 2024-01-09T20:51:03+01:00

Marcin Twarowski commented

2024-01-09 20:51:03 +01:00

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3080 Ti/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 546.33

Blender Version
Broken: version: 4.1.0 Alpha, branch: main, commit date: 2024-01-09 03:34, hash: a39c16270ce5

Short description of error
Video file is imported as an animated texture. Changing "Time Stretching" values in the "Output Properties" will make different frames of the video to be displayed, depending which engine is used. There are 24 frames in the video. 'Old' and 'New' are set to 24/12:

Exact steps for others to reproduce the error

Unzip the attached file. It contains .blend file and the test video file.
After opening, switch to "Rendered" mode.
Switch from EEVEE to Cycles. You should see that the displayed frame of the texture is not the same depending on the engine.
On Cycles, if you update the "Time Stretching", (in Properties > Output > Frame Range > Time Stretching), you'll notice that the corresponding frame for the image will not be applied.

Also note that EEVEE may not refresh properly if you render in Cycles first. In that case skipping to a different frame in the timeline should refresh it.

It seems to me that the EEVEE is the correct behavior? Setting 'New' value to a lower number is supposed to speed up the animation.

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3080 Ti/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 546.33 **Blender Version** Broken: version: 4.1.0 Alpha, branch: main, commit date: 2024-01-09 03:34, hash: `a39c16270ce5` **Short description of error** Video file is imported as an animated texture. Changing "Time Stretching" values in the "Output Properties" will make different frames of the video to be displayed, depending which engine is used. There are 24 frames in the video. 'Old' and 'New' are set to 24/12: ![obraz](/attachments/c520c911-4cbe-4be1-8722-64f207a48126) **Exact steps for others to reproduce the error** - Unzip the attached file. It contains .blend file and the test video file. - After opening, switch to "Rendered" mode. - Switch from EEVEE to Cycles. You should see that the displayed frame of the texture is not the same depending on the engine. - On Cycles, if you update the "Time Stretching", (in `Properties` > `Output` > `Frame Range` > `Time Stretching`), you'll notice that the corresponding frame for the image will not be applied. Also note that EEVEE may not refresh properly if you render in Cycles first. In that case skipping to a different frame in the timeline should refresh it. It seems to me that the EEVEE is the correct behavior? Setting 'New' value to a lower number is [supposed to speed up the animation](https://docs.blender.org/manual/en/latest/render/output/properties/frame_range.html#time-stretching).

obraz.png

4.5 KiB

time_stretching_test.zip

172 KiB

Marcin Twarowski added the

labels 2024-01-09 20:51:03 +01:00

Germano Cavalcante commented

2024-01-10 21:00:41 +01:00

Hi @MarcinTwarowski, thank you for the report.

I can confirm the issue you mentioned. It seems that Cycles is displaying a different frame of the texture compared to EEVEE, Workbench, UV Editor...
These engines seems use the same code to display the corresponding frame in the image, but Cycles behaves differently, it seems to ignore the Time Stretching.

Hi @MarcinTwarowski, thank you for the report. I can confirm the issue you mentioned. It seems that Cycles is displaying a different frame of the texture compared to EEVEE, Workbench, UV Editor... These engines seems use the same code to display the corresponding frame in the image, but Cycles behaves differently, it seems to ignore the `Time Stretching`.

Germano Cavalcante added

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Time Stretching and video texture - difference between Cycles and Eevee #116958