Bug 404938

Summary:	kdenlive cornerswidget not displaying lines and markers correctly
Product:	[Applications] kdenlive	Reporter:	reneg <renegodbout>
Component:	Video Effects & Transitions	Assignee:	Vincent PINON <vpinon>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	fritzibaby
Priority:	NOR	Flags:	fritzibaby: Brainstorm+
Version First Reported In:	18.12.1
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description reneg 2019-03-01 08:16:12 UTC

SUMMARY
The cornerswidget (ex. frei0r.c0rners) GUI does not track correctly. 

STEPS TO REPRODUCE
1.add c0rners effect on a clip (10 sec is enough) 
2.create a small "window" near the top left of screen.
3.add keyframe at end of clip and reposition the corners near bottom right.

OBSERVED RESULT
when playing or stepping frames with the effect lines and markers in view, the position(s) of the "c0rnered" element is/are correct but the lines/markers drift progressively away from the element. The offset seems proportional to the magnitude of the displacement (cumulative rounding error?). 
On the last frame (or near the end where the offset is visible), if you try to move one of the markers, they all snap to their correct positions.   
The error is only in the GUI of the effect, if you position your corners on reference details of the background, the effect is composited at the right place, only the red lines and markers drift away... 

EXPECTED RESULT
perfect match!...

SOFTWARE/OS VERSIONS
Windows: 
MacOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

Comment 1 emohr 2019-03-02 14:49:01 UTC

18.12.1 and Refactoring AppImage: effect Corners, the red lines doesn’t match and are outside of the clip on the top and the left side of the clip. The distance between the clip and the red line is constant during movement.

Comment 2 emohr 2021-03-05 18:21:09 UTC

All effects are updated in version 20.12.

Please try with the current Kdenlive AppImage version 20.12.2  https://download.kde.org/stable/kdenlive/20.12/linux/

Comment 3 Bug Janitor Service 2021-03-20 04:33:39 UTC

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
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If you have already provided the requested information, please
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Comment 4 Bug Janitor Service 2021-04-04 04:33:38 UTC

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!