https://bugs.kde.org/show_bug.cgi?id=523415

--- Comment #4 from Jean-Baptiste Mardelle <[email protected]> ---
So here is some feedback on the problem, which is definitely interesting.
Currently in Kdenlive, the default transition uses MLT's "Composite"
transition. This transition is deprecated in MLT and should not be used
anymore. The only reason why we keep it is that the MLT "Luma" transition, that
should replace it does not correctly handle transparency. This is a
longstanding issue that forced us to keep both and caused confusion.

So I finally decided to have a closer look and just submitted a merge request
for MLT (*) that would fix the "Luma" transition in MLT. This would allow us to
get rid of the "Composite" transition, and would indeed fix this bug. Waiting
for some feedback from MLT maintainers.

*) https://github.com/mltframework/mlt/pull/1276

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