VSE wipe (with transparent 2nd input ) broken in RC1 ! #39057

New Issue

David Salvo · 2014-03-08T22:51:23+01:00

David Salvo commented

2014-03-08 22:51:23 +01:00

System Information
Mint Cinnamon 15 (3.8.0-19-generic)
NVIDIA G92 [GeForce 9800 GT]

Blender Version
Broken: 2.7 RC1 (19f7f9a)
Worked: 2.7 Testbuild (10f4c62)

Short description of error

This has broken my current project (yes I can render frames from older version but would like to get it fixed!), I used to be able to wipe from one image to another with a transparency, and the original image would show beneath it (with both the transparent image's blend mode and the wipe effect strip's blend mode set to alpha over). In RC1 it no longer works...

Exact steps for others to reproduce the error
Load one image(or video), then an image(or video?) with transparency.
Place the transparent image one channel higher and cross over.
Add wipe (so bottom opaque image wiping to top transparent image).
Set transparent image's mode to alpha over and the wipe effect stripe's mode to alpha over as well.
The top transparent image will not use its alpha channel to see through to the bottom strip.

Sorry I am running late for something and no time to attach a blend file! It's pretty easy to reproduce.

Thanks in advance.

**System Information** Mint Cinnamon 15 (3.8.0-19-generic) NVIDIA G92 [GeForce 9800 GT] **Blender Version** Broken: 2.7 RC1 (19f7f9a) Worked: 2.7 Testbuild (10f4c62) **Short description of error** This has broken my current project (yes I can render frames from older version but would like to get it fixed!), I used to be able to wipe from one image to another with a transparency, and the original image would show beneath it (with both the transparent image's blend mode and the wipe effect strip's blend mode set to alpha over). In RC1 it no longer works... **Exact steps for others to reproduce the error** Load one image(or video), then an image(or video?) with transparency. Place the transparent image one channel higher and cross over. Add wipe (so bottom opaque image wiping to top transparent image). Set transparent image's mode to alpha over and the wipe effect stripe's mode to alpha over as well. The top transparent image will not use its alpha channel to see through to the bottom strip. Sorry I am running late for something and no time to attach a blend file! It's pretty easy to reproduce. Thanks in advance.

David Salvo commented

2014-03-08 22:51:23 +01:00

Changed status to: 'Open'

David Salvo commented

2014-03-08 22:51:23 +01:00

Added subscriber: @slinkeepie

Bastien Montagne commented

2014-03-18 16:04:39 +01:00

Added subscriber: @mont29

Bastien Montagne commented

2014-03-18 16:05:49 +01:00

Please do add a small demo .blend file, we have hundreds of reports to check each week, so saving even five mins on each is important for us!

David Salvo commented

2014-03-18 17:26:44 +01:00

Hey there,

I've attached the files, I thought you could pack the images into the .blend itself, it didn't work?
Anyway: transparent_wipe_blender_bug.tar.bz2

Hey there, I've attached the files, I thought you could pack the images into the .blend itself, it didn't work? Anyway: [transparent_wipe_blender_bug.tar.bz2](https://archive.blender.org/developer/F81735/transparent_wipe_blender_bug.tar.bz2)

Bastien Montagne commented

2014-03-18 19:18:11 +01:00

Thanks for the file, issue confirmed. :/

(And no, packing files used by compositor does not work - sigh…)

Thanks for the file, issue confirmed. :/ (And no, packing files used by compositor does not work - sigh…)

Bastien Montagne self-assigned this 2014-03-18 19:18:28 +01:00

Bastien Montagne removed their assignment 2014-03-18 20:12:46 +01:00

Sergey Sharybin was assigned by Bastien Montagne

2014-03-18 20:12:46 +01:00

Bastien Montagne commented

2014-03-18 20:12:46 +01:00

Hrrrmm… In fact, I would be tempt to call 2.69 behavior buggy…

Assigning to Sergey to get its advice, but imho an effect strip should always completely "replace" its operand ones, not allow to be overlayed over one of them…

Hrrrmm… In fact, I would be tempt to call 2.69 behavior buggy… Assigning to Sergey to get its advice, but imho an effect strip should always completely "replace" its operand ones, not allow to be overlayed over one of them…

Sergey Sharybin commented

2014-03-19 05:48:36 +01:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2014-03-19 05:48:36 +01:00

Sergey Sharybin commented

2014-03-19 05:48:36 +01:00

This is an intentional change to the sequencer stack renderer made in b3bc9e4 to address #38598.

If the effect mixes with it's inputs it gives really unpredictable results when blending images with alpha and i'm pretty much sure no other software would allow effect to blend together with it's inputs.

Even with your file you can see the buggy behavior in 2.69 -- last frame of wipe effect is different from first frame after that wipe effect, and there's no sane reason for this.

I'll document this in the release notes pages and call it a known change in the behavior.

This is an intentional change to the sequencer stack renderer made in b3bc9e4 to address #38598. If the effect mixes with it's inputs it gives really unpredictable results when blending images with alpha and i'm pretty much sure no other software would allow effect to blend together with it's inputs. Even with your file you can see the buggy behavior in 2.69 -- last frame of wipe effect is different from first frame after that wipe effect, and there's no sane reason for this. I'll document this in the release notes pages and call it a known change in the behavior.

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VSE wipe (with transparent 2nd input ) broken in RC1 ! #39057