VSE Render time increases for scenes containing scenes #106162

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Michael-Chu · 2023-03-27T05:12:23+02:00

Michael-Chu commented

2023-03-27 05:12:23 +02:00

System Information
Operating system: Linux-5.10.57-antix.1-amd64-smp-x86_64-with-glibc2.31 64 Bits
Graphics card: Mesa DRI Intel(R) HD Graphics 4400 (HSW GT2) Intel Open Source Technology Center 4.5 (Core Profile) Mesa 20.3.5

Blender Version
Broken: version: 3.4.1, branch: blender-v3.4-release, commit date: 2022-12-19 17:00, hash: rB55485cb379f7
Worked: 3.1.0

Short description of error
When rendering a scene using FFmpeg with the Video Sequence Editor, if it contains a scene strip with "Sequencer" input then the rendering time increases dramatically. If that contained scene also contains a scene strip, then rendering time increases even more. I have tested up to 5 levels deep and the render time keeps increasing.
The VSE preview speed is not affected by the inclusion of scene strips.

Exact steps for others to reproduce the error

Start a new project for Video Editing
In the VSE, rename the scene as "Full video". Add any movie file
Configure the scene: set frame range for 10 seconds; match output resolution to movie dimensions
Configure Output Properties to use FFmpeg Video with the "H264 in MP4" presets
Render animation and note the time taken
Create a new Scene using the "Copy Settings" option. Call it "Scene of scene"
In this scene, add a Scene strip and select the original "Full video" scene. Set Input = Sequencer
Render animation and note the time taken
Create a new Scene using the "Copy Settings" option. Call it "Scene of scene of scene"
In this scene, add a Scene strip and select the "Scene of scene" scene. Set Input = Sequencer
Render animation and note the time taken

**System Information** Operating system: Linux-5.10.57-antix.1-amd64-smp-x86_64-with-glibc2.31 64 Bits Graphics card: Mesa DRI Intel(R) HD Graphics 4400 (HSW GT2) Intel Open Source Technology Center 4.5 (Core Profile) Mesa 20.3.5 **Blender Version** Broken: version: 3.4.1, branch: blender-v3.4-release, commit date: 2022-12-19 17:00, hash: `rB55485cb379f7` Worked: 3.1.0 **Short description of error** When rendering a scene using FFmpeg with the Video Sequence Editor, if it contains a scene strip with "Sequencer" input then the rendering time increases dramatically. If that contained scene also contains a scene strip, then rendering time increases even more. I have tested up to 5 levels deep and the render time keeps increasing. The VSE preview speed is not affected by the inclusion of scene strips. **Exact steps for others to reproduce the error** 1. Start a new project for Video Editing 2. In the VSE, rename the scene as "Full video". Add any movie file 3. Configure the scene: set frame range for 10 seconds; match output resolution to movie dimensions 4. Configure Output Properties to use FFmpeg Video with the "H264 in MP4" presets 5. Render animation and note the time taken 6. Create a new Scene using the "Copy Settings" option. Call it "Scene of scene" 7. In this scene, add a Scene strip and select the original "Full video" scene. Set Input = Sequencer 8. Render animation and note the time taken 9. Create a new Scene using the "Copy Settings" option. Call it "Scene of scene of scene" 10. In this scene, add a Scene strip and select the "Scene of scene" scene. Set Input = Sequencer 11. Render animation and note the time taken

created_in_310.blend

711 KiB

Michael-Chu added the

labels 2023-03-27 05:12:24 +02:00

Richard Antalik commented

2023-03-29 20:53:24 +02:00