https://bugs.kde.org/show_bug.cgi?id=358177

Jean-Baptiste Mardelle <j...@kdenlive.org> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |CONFIRMED
     Ever confirmed|0                           |1

--- Comment #5 from Jean-Baptiste Mardelle <j...@kdenlive.org> ---
Ok, I just checked and MLT's luma transition does not support alpha channel. 
To fix the proble, we can internally, we use MLT's "composite" transition with
a luma, which works with alpha instead of using MLT's "luma" transition. I
managed to make it work, however that means that when opening projects with the
previous real "luma" transition we have to convert all parameters to make it
work with the new "composite" way...  will try to finish implementing it this
week-end. As a workaround you can manually use the composite transition with a
luma.

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