VSE: Blend Modes on Scenes do not layer properly #50882
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Reference: blender/blender#50882
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System Information
macOS Sierra (NVIDIA GeForce GTX 775M
Blender Version
Broken: 2.78 (2017-03-07 Hash:
15fa806
)Worked: 2.78 (2017-02-06 Hash:
f7eaaf3
)Short description of error
When using the Blend option for Scenes, using anything other than Replace behaves, essentially, like Replace. So when I add a Scene and try to use Alpha Over on top of a video, the render output only shows the Scene (text and a black screen, in my case).
Exact steps for others to reproduce the error
(Included, please find a zip file with appropriate files to recreate this issue; to recreate, switch to the VSE, change to the MainVideo scene, and hit Render or Animation)alphaover_issue.zip
Changed status to: 'Open'
Added subscriber: @jakeh14
Added subscriber: @snuq
Your 'Text' scene needs to have transparency enabled in its render settings, enable that and transparency in the vse should work fine.
Please specify where in the Render settings you are referring to. Here's what I have tried:
Please note I have tried the attached file in the "Worked" version I noted above -- it renders as expected in that version with no changes, but not the latest nightly build.
Side note: I realize that I forgot to specify which Scene to Render in -- the Scene to have open in VSE is MainVideo. I've updated the original text.
ok, in the file you provided, the 'transparent' checkbox in the render properties of the 'Text' scene is not checked, that does need to be enabled for proper transparency in the scene strip, and it fixed it on my computer at least (on 2.78c). You should probably change that in the example file.
I can confirm the bug in the latest build tho, blender seems to 'know' that it should be transparent (it shows the checkerboard background in the preview), it just doesn't mix it.
I am seeing this problem in the nightly build as well, not in 2.78c.
As an aside, the Transparent box you're talking about isn't necessary for the Blend to work properly in VSE -- changing the Alpha Mode in the VSE Strip Properties channel is (normally) sufficient.
Added subscriber: @dfelinto
The bug was introduced on
b641d016e1
How to reproduce it - open:
VSE-alpha-issue-background.blend
Render it!
The green background shows in 2.78 but not in master.
This issue was referenced by
06ac6ded66
Changed status from 'Open' to: 'Resolved'