VSE: Playback speed regression #65333

New Issue

Richard Antalik · 2019-05-31T02:17:44+02:00

Richard Antalik commented

2019-05-31 02:17:44 +02:00

System Information
Operating system: Windows

Blender Version
Broken: 2.80, 451c533e25

Short description of error
Default Video Editing startup file has slower video playback then old file created with Blender 2.79

fast.blend

Exact steps for others to reproduce the error
It may be harder to reproduce on high-end machine, but in my case:

Factory startup
Open Video editing template
Add indexed video file
Set resolution / proxy size to match input
Set frame rate (59.94 was desired in my case)
Disable cache to rule out influence
Play

Got:

26 FPS with alpha over blend
39 FPS with cross blend (should be same as alpha over when opacity is 1, but that's another bug)

With fast.blend I got:

47 FPS with alpha over blend
unstable, but 60 FPS with cross blend
- 88 FPS maximum, when set scene FPS to 120

fast.blend file was probably created with Blender 2.79
I noticed this issue by coincidence. I will investigate cause of this, but reporting for testing, or if somebody wants to dive into this, I wouldn't mind.

@brecht if this is confirmed, should it be high prio?

**System Information** Operating system: Windows **Blender Version** Broken: 2.80, 451c533e25dde0c574a22fcbbd2624e09c804926 **Short description of error** Default Video Editing startup file has slower video playback then old file created with Blender 2.79 [fast.blend](https://archive.blender.org/developer/F7080441/fast.blend) **Exact steps for others to reproduce the error** It may be harder to reproduce on high-end machine, but in my case: - Factory startup - Open Video editing template - Add indexed video file - Set resolution / proxy size to match input - Set frame rate (59.94 was desired in my case) - Disable cache to rule out influence - Play Got: - 26 FPS with alpha over blend - 39 FPS with cross blend (should be same as alpha over when opacity is 1, but that's another bug) With fast.blend I got: - 47 FPS with alpha over blend - unstable, but 60 FPS with cross blend - 88 FPS maximum, when set scene FPS to 120 fast.blend file was probably created with Blender 2.79 I noticed this issue by coincidence. I will investigate cause of this, but reporting for testing, or if somebody wants to dive into this, I wouldn't mind. @brecht if this is confirmed, should it be high prio?

Richard Antalik commented

2019-05-31 02:17:44 +02:00

Added subscribers: @brecht, @iss

Brecht Van Lommel commented

2019-05-31 17:38:50 +02:00

Could be high priority, depends what the cause is.

Richard Antalik self-assigned this 2019-06-02 22:42:17 +02:00

Richard Antalik commented

2019-06-02 22:42:17 +02:00

Overhead is caused by image scaling in preprocessing stage. Linear interpolation is used, when render anti-aliasing is used in workbench settings, even if render engine is not set to workbench.

This also can affect quality of final render.

Overhead is caused by image scaling in preprocessing stage. Linear interpolation is used, when render anti-aliasing is used in workbench settings, even if render engine is not set to workbench. This also can affect quality of final render.

blender-admin commented

2019-06-06 21:42:41 +02:00

This issue was referenced by 2175fb0217

This issue was referenced by 2175fb02170401355697dec36bed9be6a72c5570

Richard Antalik commented

2019-06-07 01:25:00 +02:00

Changed status from 'Open' to: 'Resolved'

Richard Antalik closed this issue

2019-06-07 01:25:00 +02:00

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VSE: Playback speed regression #65333