VSE Low Playback Rate: Show Cache On will cause a lower fps #70229

New Issue

tintwotin · 2019-09-25T09:45:28+02:00

tintwotin commented

2019-09-25 09:45:28 +02:00

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: Intel(R) UHD Graphics 600 Intel 4.5.0 - Build 24.20.100.6137

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f5449

Having Show Cache On will give a lower fps(gif):

Play a heavy video clip in the VSE and notice the difference in frame rate when switching the Show Cache on/off.

System Information Operating system: Windows-10-10.0.17763 64 Bits Graphics card: Intel(R) UHD Graphics 600 Intel 4.5.0 - Build 24.20.100.6137 Blender Version Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f5449 Having Show Cache On will give a lower fps(gif): ![cache draw.gif](https://archive.blender.org/developer/F7772925/cache_draw.gif) Play a heavy video clip in the VSE and notice the difference in frame rate when switching the Show Cache on/off.

tintwotin commented

2019-09-25 09:45:28 +02:00

Added subscriber: @tintwotin

blender-admin commented

2019-09-25 09:45:28 +02:00

#69927 was marked as duplicate of this issue

ChristopherAnderssarian commented

2019-09-25 11:13:12 +02:00

Added subscribers: @iss, @ChristopherAnderssarian

Richard Antalik was assigned by ChristopherAnderssarian

2019-09-25 11:13:12 +02:00

ChristopherAnderssarian commented

2019-09-25 11:13:12 +02:00

@tintwotin, @iss already re-opened #69927#781641 wouldn't have thought we need another report...

Brecht Van Lommel commented

2019-09-25 12:35:15 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2019-09-25 12:35:15 +02:00

Please use the template and provide all the requested information, even if you're a developer.
https://developer.blender.org/maniphest/task/edit/form/1/

Please use the template and provide all the requested information, even if you're a developer. https://developer.blender.org/maniphest/task/edit/form/1/

Richard Antalik commented

2019-09-30 00:26:20 +02:00

Added subscriber: @JacquesLucke

tintwotin commented

2019-09-30 08:49:49 +02:00

Could we have Show Cache switched off as the default setting until this is resolved?

Richard Antalik commented

2019-09-30 09:30:23 +02:00

Not sure of cost vs. benefit here. Performance loss is nowhere near cross vs alpha over.

most likely on recent machines not even noticable

Not sure of cost vs. benefit here. Performance loss is nowhere near cross vs alpha over. most likely on recent machines not even noticable

tintwotin commented

2019-09-30 09:49:56 +02:00

Well, users shouldn't have to deal with cache in the first place - is should work unnoticeable - so being able watch the cache working is imo mainly a developer/debugging tool - and therefore should be off as the default setting.

That said, the slow playback performance of the VSE is a real problem, and has always been. You will not find any video editor out there with a slower playback rate than Blender. Not dealing with regressions which makes the playback even worse is imo not the way to attract more users.

It should also be noted that this regression multiplies, when adding more instances of the Sequencer area: #69927

Well, users shouldn't have to deal with cache in the first place - is should work unnoticeable - so being able watch the cache working is imo mainly a developer/debugging tool - and therefore should be off as the default setting. That said, the slow playback performance of the VSE is a real problem, and has always been. You will not find any video editor out there with a slower playback rate than Blender. Not dealing with regressions which makes the playback even worse is imo not the way to attract more users. It should also be noted that this regression multiplies, when adding more instances of the Sequencer area: #69927

Richard Antalik was unassigned by Dalai Felinto

2019-12-23 13:49:25 +01:00

Brecht Van Lommel commented

2020-01-21 18:31:23 +01:00

I think it makes some sense to disable the cache visualization by default if it really has a significant performance impact.

In principle it should be possible to make drawing it really fast. For OpenGL it might be most efficient to allocate a 1D texture and draw it with nearest interpolation. Updating only the part that changed is possible as well. But it's not a trivial change.

I think it makes some sense to disable the cache visualization by default if it really has a significant performance impact. In principle it should be possible to make drawing it really fast. For OpenGL it might be most efficient to allocate a 1D texture and draw it with nearest interpolation. Updating only the part that changed is possible as well. But it's not a trivial change.

tintwotin commented

2020-02-12 09:16:18 +01:00

Having the "Show Cache" on actually causes a serious drop in fps over time - in ca. 20 sec 40 fps are lost(from 60 fps to 20 fps) - looks like a regression?
This does not happen when "Show Cache" is off.

Having the "Show Cache" on actually causes a serious drop in fps over time - in ca. 20 sec 40 fps are lost(from 60 fps to 20 fps) - looks like a regression? This does not happen when "Show Cache" is off. ![Draw_Cache_fps_drop.gif](https://archive.blender.org/developer/F8335982/Draw_Cache_fps_drop.gif)

ChristopherAnderssarian commented

2020-02-12 23:26:47 +01:00

As requested by @tintwotin :

Data sourced from 2019_03_31_001-edit.mp4.blend

This is a snippet from Spring.

TL;DR

Cache on ~100fps
Cache off ~130fps

As requested by @tintwotin [: ](https://docs.google.com/spreadsheets/d/1p8Yei5icO-K8aCybtvH4wHx3_xzSqDZSsbyfgzC7sbQ/edit?usp=sharing) ![VSE Cache (view) on vs off.png](https://archive.blender.org/developer/F8337043/VSE_Cache__view__on_vs_off.png) Data sourced from [2019_03_31_001-edit.mp4.blend](https://archive.blender.org/developer/F8337045/2019_03_31_001-edit.mp4.blend) This is a snippet from Spring. ### TL;DR **Cache on ~100fps** **Cache off ~130fps**

Richard Antalik commented

2020-02-13 00:44:29 +01:00

Thanks for data,

I have patch almost ready for quite some time.. I just need to find shader for drawing - it wasn't immediately obvious how to do it.

Thanks for data, I have patch almost ready for quite some time.. I just need to find shader for drawing - it wasn't immediately obvious how to do it.

blender-admin commented

2020-02-17 16:02:36 +01:00

This issue was referenced by 18b693bdbd

This issue was referenced by 18b693bdbd6bac7c381e46aa4b95c3e81494855e

Richard Antalik commented

2020-02-17 16:48:22 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Richard Antalik closed this issue

2020-02-17 16:48:22 +01:00

Richard Antalik self-assigned this 2020-02-17 16:48:22 +01:00

Thomas Dinges added this to the 2.83 LTS milestone 2023-02-08 16:39:38 +01:00

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VSE Low Playback Rate: Show Cache On will cause a lower fps #70229

TL;DR