https://bugs.kde.org/show_bug.cgi?id=389220
Bug ID: 389220
Summary: "alphain" transition doesn't work
Product: kdenlive
Version: 17.12.0
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: Effects & Transitions
Assignee: vpi...@kde.org
Reporter: unf...@gmail.com
Target Milestone: ---
I use an alphain transition (as compositor basically) to use a grayscale image
on one track as an alpha mask for video underneath - this way I can achieve a
nice composit of two videos.
In Kdenlive 17.04.3 it works.
In kdenlive 17.12.0 it doesn't work any more. Another effects seem to work
fine, but this one that I need so much doesn't. I don't know of another way to
achieve this effect in Kdenlive and it's key to do what I want to do. I tried
everything for hours and came up with "alphain".
I know I could use multiply with an inverted mask on the background and
multiply with non-inverted mask on the foreground and then add both together.
However that adds more layers to achieve the same effect and probably also will
hit the rendering performance.
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