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Maniphest T74440

Video Sequencer: The Blend Factor in Color Mix strips is broken.
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Description

System Information
Operating system: Windows-10-10.0.17763-SP0 64 Bits
Graphics card: Intel(R) UHD Graphics 600 Intel 4.5.0 - Build 26.20.100.7262

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash: rB77d23b0bd76f

Short description of error
The Blend Factor in Color Mix strips has no effect.

Exact steps for others to reproduce the error

  • Add two strips to the sequencer.
  • Select them both.
  • Add a Color Mix effect strip.
  • In the sidebar, change the Blend Factor.
  • Nothing happens.

This is a bug, as this function is supposed to set the amount of how much influence either input should have.

(On the same note: Sidebar > Adjust > Composite > Blend Modes are completely missing the Blend Factor)

Revisions and Commits

rB Blender
AbandonedD7314 Fix T74440: Blend Factor in Color Mix strips is broken

Related Objects

Event Timeline

Peter Fog (tintwotin) created this task.Mar 4 2020, 4:29 PM
Peter Fog (tintwotin) added a project: Video Sequencer.
Richard Antalik (ISS) changed the task status from Needs Triage to Confirmed.Mar 4 2020, 5:44 PM
Richard Antalik (ISS) changed the subtype of this task from "Report" to "Bug".
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

Seems like blend_color_add_float expects 'control' alpha in second input, while blend_color_add_byte expects it in first input.

Richard Antalik (ISS) mentioned this in D3163: VSE: Remove Add, Sub, Mul effects.Mar 4 2020, 5:57 PM
Peter Fog (tintwotin) updated the task description. (Show Details)Mar 6 2020, 10:32 AM
Richard Antalik (ISS) added a revision: D7314: Fix T74440: Blend Factor in Color Mix strips is broken.Apr 3 2020, 5:21 AM
Richard Antalik (ISS) merged a task: T76376: VSE Opacity Not Working With Certain Blend Types.May 5 2020, 1:15 PM
Richard Antalik (ISS) added a subscriber: Kristian Holmgren (defutura).
Kristian Holmgren (defutura) added a comment.May 5 2020, 1:33 PM

A comment on the merge: while this is similar to T76376: VSE Opacity Not Working With Certain Blend Types, there's one difference: you don't have to add a Color Mix effect strip, the issue also affects the regular blending of two movie/image strips for the 18 blend types I mentioned. Then again, the underlying cause may very well be the same.

Richard Antalik (ISS) edited projects, added BF Blender (2.90); removed BF Blender.Jun 7 2020, 7:58 PM
Peter Fog (tintwotin) closed this task as Archived.Jun 9 2020, 8:32 AM
Peter Fog (tintwotin) claimed this task.
Philipp Oeser (lichtwerk) mentioned this in T79333: Some Blend mode opacity in VSE (Video Sequence Editor) cannot adjust opacity.Jul 28 2020, 10:56 AM
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).Jul 28 2020, 10:59 AM

Not sure why this was closed?

This still seems broken and was reported again in T79333: Some Blend mode opacity in VSE (Video Sequence Editor) cannot adjust opacity.
Can only imagine this being a duplicate of T75844: Blend modes are broken?

Philipp Oeser (lichtwerk) closed this task as a duplicate of T75844: Blend modes are broken.Jul 28 2020, 10:59 AM
Philipp Oeser (lichtwerk) mentioned this in T75844: Blend modes are broken.Jul 28 2020, 11:05 AM
Philipp Oeser (lichtwerk) mentioned this in T86367: VSE: Color in Overlay does not fade.Mar 8 2021, 11:44 PM