Compositor movie not rendering if cache is full #112804

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opened 2023-09-24 13:16:47 +02:00 by ichlubna · 3 comments

ichlubna commented

2023-09-24 13:16:47 +02:00

System Information
Operating system: Arch Linux
Graphics card: RTX 2070

Blender Version
Broken: 3.6.2
Worked 2.93

Short description of error
The Viewer output in Compositor becomes buggy after some time of using when using input videos in the graph. It seems like it happens when too many video frames are loaded in the memory. Is there a memory leak in such case?
The problem disappears when rendering (F12 Render Image). This is actually a temporal fix. When the problem occurs I always hit F12 just to get rid of it until it appears again. Rendering probably clears the cache?
The result on the backdrop starts to seem like weirdly translated or some of the used videos completely disappears.

Exact steps for others to reproduce the error

Open Compositor, tick Use Nodes and enable Backdrop
Import two 4K videos via Image node and set the number of frames to input length
Use Mix node to blend the videos by factor 0.5 so both are used
Connect the result to the Viewer node
Keep moving along the timeline to render new views in the backdrop until the result starts to be buggy

Attached archive contains an example project. When I keep pressing the right button to create new views, one of the videos disappears after some time.

Edit: The file was too large so here it goes.

**System Information** Operating system: Arch Linux Graphics card: RTX 2070 **Blender Version** Broken: 3.6.2 Worked 2.93 **Short description of error** The Viewer output in Compositor becomes buggy after some time of using when using input videos in the graph. It seems like it happens when too many video frames are loaded in the memory. Is there a memory leak in such case? The problem disappears when rendering (F12 Render Image). This is actually a temporal fix. When the problem occurs I always hit F12 just to get rid of it until it appears again. Rendering probably clears the cache? The result on the backdrop starts to seem like weirdly translated or some of the used videos completely disappears. **Exact steps for others to reproduce the error** 1. Open Compositor, tick Use Nodes and enable Backdrop 2. Import two 4K videos via Image node and set the number of frames to input length 3. Use Mix node to blend the videos by factor 0.5 so both are used 4. Connect the result to the Viewer node 4. Keep moving along the timeline to render new views in the backdrop until the result starts to be buggy Attached archive contains an example project. When I keep pressing the right button to create new views, one of the videos disappears after some time. Edit: The file was too large so [here](https://drive.google.com/file/d/1qMdQ9raJ08ceMCpVDJVC2N0fdTCD0eka/view?usp=sharing) it goes.

ichlubna added the

labels 2023-09-24 13:16:47 +02:00

Iliya Katushenock added the

Nodes & Physics

labels 2023-09-24 13:50:46 +02:00

Germano Cavalcante commented

2023-09-25 19:00:02 +02:00

Member

Thanks for the report, @ichlubna.

Apparently you forgot to attach the "example project"?

I tried to replicate the problem using 4k videos from https://www.pexels.com/search/videos/4k/ , but Blender had no problem with them.

Could you specify the duration and resolution of the input videos you are using?
Are you experiencing this issue with any specific video format, or does it occur with all video formats?
Have you monitored the system's memory usage while using Blender?

System Information

Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3060 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 528.79

Thanks for the report, @ichlubna. Apparently you forgot to attach the "example project"? I tried to replicate the problem using 4k videos from https://www.pexels.com/search/videos/4k/ , but Blender had no problem with them. - Could you specify the duration and resolution of the input videos you are using? - Are you experiencing this issue with any specific video format, or does it occur with all video formats? - Have you monitored the system's memory usage while using Blender? <details> <summary>System Information</summary> <ul> Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3060 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 528.79 </ul> </details>

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labels 2023-09-25 19:00:13 +02:00

ichlubna commented

2023-09-25 19:10:14 +02:00

Author

Apparently you forgot to attach the "example project"?

Sorry, it was too large so I added a link.

Could you specify the duration and resolution of the input videos you are using?

Are you experiencing this issue with any specific video format, or does it occur with all video formats?

The example videos are in the project archive. But it happens with others as well.

Have you monitored the system's memory usage while using Blender?

Did it now. It starts when the memory is used at 11 GB in total. 7 GB was probably already used. When I hit F12, the memory gets freed again.

Thanks for your guidance. It seems like the limit is actually 4 GB of the Memory Cache Limit in the Video Sequencer section in Preferences. I changed it to 10 GB and the problem does not appear anymore. When I change it to 1 GB it appears sooner.

I still think that the behavior I experience is a bug. The cache should get freed and rewritten, right? The mechanism seems to be buggy in my case and probably places the new frames at wrong positions.

> Apparently you forgot to attach the "example project"? Sorry, it was too large so I added a link. > - Could you specify the duration and resolution of the input videos you are using? > - Are you experiencing this issue with any specific video format, or does it occur with all video formats? The example videos are in the project archive. But it happens with others as well. > - Have you monitored the system's memory usage while using Blender? Did it now. It starts when the memory is used at 11 GB in total. 7 GB was probably already used. When I hit F12, the memory gets freed again. Thanks for your guidance. It seems like the limit is actually 4 GB of the Memory Cache Limit in the Video Sequencer section in Preferences. I changed it to 10 GB and the problem does not appear anymore. When I change it to 1 GB it appears sooner. I still think that the behavior I experience is a bug. The cache should get freed and rewritten, right? The mechanism seems to be buggy in my case and probably places the new frames at wrong positions.

Germano Cavalcante added

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labels 2023-09-25 19:33:12 +02:00

Richard Antalik commented

2023-09-26 00:42:06 +02:00

Member

Can confirm. You can also set cache to 0 to disable it if you don't need it.

Can confirm. You can also set cache to 0 to disable it if you don't need it.

Richard Antalik changed title from ~~Compositor view becoming buggy after some time - memory problem with new input video frames?~~ to Compositor movie not rendering if cache is full

2023-09-26 00:45:24 +02:00

Richard Antalik added

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labels 2023-09-26 00:46:12 +02:00

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