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.
I confirm. It seems all Alpha transitions don’t work. Tested with AppImage 18.12.0d, Refactoring, Windows 18.12.0.
Still not working with 20.12.3.
Can you please test again? With the latest nightly? There have been some alpha fixes recently and in my tests it seems fixed. Please read https://docs.kdenlive.org/en/effects_and_compositions/transitions/alpha_operation_transitions.html to make sure you are expecting the correct behaviour.
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!