Blender VSE suddenly laggy. Lag persists after deleting all strips. #128464

New Issue

Alessandro-Terlizzi · 2024-10-02T02:21:37+02:00

2024-10-02 02:21:37 +02:00

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 536.23

Blender Version
Broken: version: 4.2.2 LTS, branch: blender-v4.2-release, commit date: 2024-09-23 12:18, hash: c03d7d98a413
Worked: (All versions I tested have the same issue)

Short description of error
The Blender video sequencer stutters when some metastrips are pasted in the project. The stutter is very particular because metastrips of similar complexity are handled very well by my system. Additionally, the stutter doesn't occur when playing the sequence, only when navigating the timeline.
The biggest issue, though, is that the stuttering persists in the project after deleting the "corrupted" strips and there is nothing I can do that gets rid of this odd interaction. Not even duplicating the file fixes it. I have also tested this on multiple computers.

Below, I have attached a video that demonstrates the issue. The sequence is very simple and worked fine before introducing the problematic strip. I have also attached an empty .blend file where I have replicated the problem

Exact steps for others to reproduce the error
-Open Blender VSE
-Paste the problematic strip

Delete the problematic strip

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 536.23 **Blender Version** Broken: version: 4.2.2 LTS, branch: blender-v4.2-release, commit date: 2024-09-23 12:18, hash: `c03d7d98a413` Worked: (All versions I tested have the same issue) **Short description of error** The Blender video sequencer stutters when some metastrips are pasted in the project. The stutter is very particular because metastrips of similar complexity are handled very well by my system. Additionally, the stutter doesn't occur when playing the sequence, only when navigating the timeline. The biggest issue, though, is that the stuttering persists in the project after deleting the "corrupted" strips and there is nothing I can do that gets rid of this odd interaction. Not even duplicating the file fixes it. I have also tested this on multiple computers. Below, I have attached a video that demonstrates the issue. The sequence is very simple and worked fine before introducing the problematic strip. I have also attached an empty .blend file where I have replicated the problem **Exact steps for others to reproduce the error** -Open Blender VSE -Paste the problematic strip - Delete the problematic strip

LagTest.rar

15 MiB

LagDemonsration.mp4

5.5 MiB

Alessandro-Terlizzi added the

labels 2024-10-02 02:21:38 +02:00

Pratik Borhade commented

2024-10-02 05:57:19 +02:00

Hi, thanks for the report. Deleting those drivers resolve the issue. Can you check?

Pratik Borhade added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2024-10-02 05:57:28 +02:00

Alessandro-Terlizzi commented

2024-10-02 17:40:27 +02:00

I apologize for not understanding well. In the empty .blend file (LagTest.blend) where can I find the drivers?

Pratik Borhade commented

2024-10-03 05:15:24 +02:00

Open driver editor 😅

Aras Pranckevicius commented

2024-10-03 15:11:34 +02:00

@PratikPB2123 it is a good question however, how that many "broken" animation drivers ended up there. Maybe some operations within Blender itself create/leak drivers? In the LagTest.blend there are a ton with the same name (sequence_editor.sequences_all["Empty.047"].transform.offset_y[0]). Maybe whichever code/system has created them, should not? There's half a million drivers in that file.

@Alessandro-Terlizzi do you recall how did you create this problematic scenario? You say "metastrips are pasted in the project" -- you mean they are pasted from another file? Or another scene? or...?

@PratikPB2123 it is a good question however, *how* that many "broken" animation drivers ended up there. Maybe some operations within Blender itself create/leak drivers? In the `LagTest.blend` there are a ton with the same name (`sequence_editor.sequences_all["Empty.047"].transform.offset_y[0]`). Maybe whichever code/system has created them, should not? There's half a million drivers in that file. @Alessandro-Terlizzi do you recall *how* did you create this problematic scenario? You say "metastrips are pasted in the project" -- you mean they are pasted from another file? Or another scene? or...?

Alessandro-Terlizzi commented

2024-10-03 15:48:49 +02:00

@PratikPB2123 I apologize again for my misunderstanding. I just started using drivers so I wasn't familiar with how to find them. Deleting the corrupt drivers from the projects seems to solve the issue. Thank you so much for the support.

@aras_p I do recall using a simple driver set-up where I was moving an image based on the position of a color strip. I never made use of this but I didn't delete the drivers. This was all inside of a metastrip. The issue might be that I duplicated and modified this metastrip, breaking the relationship set by the driver while doing so.

I broke the .blend file I sent you guys by copying and pasting the strips from the original corrupt project and deleting them. I duplicated a bunch of them so that's how that many broken drivers ended up there.

I'm not sure if this can be considered a but or not because it might be due to me using drivers incorrectly. If it helps, I can do further testing and try to replicate the situation.

@PratikPB2123 I apologize again for my misunderstanding. I just started using drivers so I wasn't familiar with how to find them. Deleting the corrupt drivers from the projects seems to solve the issue. Thank you so much for the support. @aras_p I do recall using a simple driver set-up where I was moving an image based on the position of a color strip. I never made use of this but I didn't delete the drivers. This was all inside of a metastrip. The issue might be that I duplicated and modified this metastrip, breaking the relationship set by the driver while doing so. I broke the .blend file I sent you guys by copying and pasting the strips from the original corrupt project and deleting them. I duplicated a bunch of them so that's how that many broken drivers ended up there. I'm not sure if this can be considered a but or not because it might be due to me using drivers incorrectly. If it helps, I can do further testing and try to replicate the situation.

Pratik Borhade commented

2024-10-04 12:18:33 +02:00

Thanks @aras_p . I should have investigated further 😅

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Blender VSE suddenly laggy. Lag persists after deleting all strips. #128464