https://bugs.kde.org/show_bug.cgi?id=424944
Bug ID: 424944
Summary: Multiple Effects produce unexpected clipping
Product: kdenlive
Version: 20.04.1
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Effects & Transitions
Assignee: vpi...@kde.org
Reporter: cgir...@free.fr
Target Milestone: ---
Created attachment 130594
--> https://bugs.kde.org/attachment.cgi?id=130594&action=edit
Project and PDF to describe kdenlive_multiple_effects_and_losed_regions
SUMMARY
When 1st effect moves out of video a part of picture that is moved in again by
second effect, moved out part is lost.
STEPS TO REPRODUCE
1. New project, create a white color clip, and move it to timeline.
2. Add 1st Effect "Position and Zoom", and set X to half image (ex 960 for full
HD video)
3. Add 2nd Effect "Rotate" and set Rotate X to -300
OBSERVED RESULT
In Project Monitor, all video corner are black.
EXPECTED RESULT
In Project Monitor, upper right video corner should be white.
WORK AROUND THAT FAILED
Switching effects order in stack would produce an other result, but an other
region is lost (upper left corner of white square, in the center of the video).
SOFTWARE/OS VERSIONS
Linux Ubuntu Studio 20.04 64 bits + kdenlive stable ppa up-to-date.
Kdenlive Version 20.04.1
KDE Frameworks 5.68.0
Qt 5.12.8 (construit sur 5.12.8)
Le système de fenêtres xcb
ADDITIONAL INFORMATION
. When multiple transformation effects are stacked, a virtual larger video size
should be used temporary between effects to avoid losing regions.
. Automatic computing of virtual video size may be quite difficult. 4 pixel
values could be user defined in stack effect to extend right, lift, upper and
bottom normal video.
. Changing those values should not require to modify any effects settings to
get the same result (unless regions that should no more being lost).
. Alternative solution: one mega keyframable effect that combines all
transformation effects at once to limit virtual extended video size handling to
this single effect (at least: Crop, Scale and Tilt; Rotoscoping; Position and
Zoom; Rotate and Shear; Corners).
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