https://bugs.kde.org/show_bug.cgi?id=409369
Bug ID: 409369
Summary: dissolve ignores transparency
Product: kdenlive
Version: 19.04.2
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Effects & Transitions
Assignee: vpi...@kde.org
Reporter: had...@danisch.de
Target Milestone: ---
Created attachment 121260
--> https://bugs.kde.org/attachment.cgi?id=121260&action=edit
Example as described.
SUMMARY
Put a title clip with transparent background over a video and add a dissolve
transition to make it appear smoothly. dissolve will ignore the transparency of
the background and will use the background as solid until end of dissolve
transition. Then (after dissolve) the background is correctly transparent.)
STEPS TO REPRODUCE
Simply use the attached example file or
1. Put some video or constant color (other than black) on V1 track.
2. create some title video with text and transparent background and put it over
the video on V2.
3. add a dissolve transition
4. watch or render
OBSERVED RESULT
The dissolve transition uses the transparent background as if it were fully
opaque. After the transition is finished, the background becomes transparent
and composition works as expected.
EXPECTED RESULT
transparent background should be transparent during transition
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
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