Anywhere there is a dissolve transition the video fades to/from black. It is only visible in the final rendered video. I tried various rendering methods and they all seem to have the same issue. Using Xubuntu 18.04
17.12.3 is outdated. Could you try either with the 18.12.1b or the 19.04.0 AppImage version?
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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!