https://bugs.kde.org/show_bug.cgi?id=499617

            Bug ID: 499617
           Summary: Layered video brightens bottom layer
    Classification: Applications
           Product: kdenlive
           Version: 24.12.1
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: Rendering & Export
          Assignee: j...@kdenlive.org
          Reporter: cheddarthe...@gmail.com
  Target Milestone: ---

I found an issue where when I put my face cam footage on top of the base video,
the base video gets brighter. 
This happens even for parts of the video that are not covered by the top
layer(face cam) and happens both in preview and render even when effects are
disabled for the top layer. The bottom layer has no effects. 

This does not happen when the same Face cam footage is placed on top of an
image of a frame exported from the video.

Here is a link to a short rendered clip when the face cam comes in to show how
the brightness of the whole seen increases
https://drive.google.com/file/d/1ZoupWBysmx4kSnIN4WN_QOMesL4b0hwf/view?usp=sharing
Here is another clip with a similar situation but with the bottom layer as an
image.
https://drive.google.com/file/d/1-JzVRiwzg3jzQsThjLtrR3gGA6WIvM9a/view?usp=sharing

These are not the exact same point in the video but I did test it again
afterwards with the same part of the video just to make sure that it was not a
problem with the clip itself and it is not the clip.

In its current state the brightens change is not huge so its not a problem for
this project. 

GPU 1050Ti Driver date 2025-01-26
Kdenlive: 24.12.1
MLT: 7.28.0
FFmpeg
KDE Frameworks: 6.9.0
Qt: Using 6.8.0 and built against 6.8.0
Windows 11 Version 23H2
Build ABI: x86_64-little_endian-llp64
Kernel: winnt 10.0.22631

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