Bug 508255

Summary:	blackscreen after Mask Apply
Product:	[Applications] kdenlive	Reporter:	kdesomeuser <fodmo>
Component:	Video Effects & Transitions	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	berndmj
Priority:	NOR	Keywords:	triaged
Version First Reported In:	25.04.3
Target Milestone:	---
Platform:	Microsoft Windows
OS:	Microsoft Windows
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	clip properties and project sttings screenshot

Description kdesomeuser 2025-08-14 17:10:40 UTC

effect stack:

- Secondary Color Correction Area Selection (Mask)
- Vertigo 
- Curves 
- Mask Apply

result: blackscreen in Project Monitor

Comment 1 kdesomeuser 2025-08-14 17:12:31 UTC

Created attachment 184083 [details]
clip properties and project sttings

Comment 2 kdesomeuser 2025-08-14 17:15:46 UTC

Created attachment 184084 [details]
screenshot

for some reason the screenshot was not attached in the main bug form

Comment 3 Bernd 2025-08-14 17:56:18 UTC

Please reset the Curves effect and check whether this brings back the clip in the project monitor.
Then move the horizontal divider to make the effect stack bigger so that the curves graph is displayed completely. In order to control the intensity of the effect before curves you need to just move the bottom left-hand point of the curve up (and just up and not right and up).

Comment 4 kdesomeuser 2025-08-14 21:47:27 UTC

(In reply to Bernd from comment #3)
> Please reset the Curves effect and check whether this brings back the clip
> in the project monitor.
> Then move the horizontal divider to make the effect stack bigger so that the
> curves graph is displayed completely. In order to control the intensity of
> the effect before curves you need to just move the bottom left-hand point of
> the curve up (and just up and not right and up).

using a Windows "Scale and layout" setting (https://bugs.kde.org/show_bug.cgi?id=508258) - temporarily returned the lower node. But it seems that the situation does not change. Could you check the screencast, please: https://drive.google.com/file/d/1RhKmpfSfN0VNw02ieluCCBwubAjzDM7E/view?usp=drive_link

I also attach project and videotrack: https://drive.google.com/drive/folders/1bs_t-gyhhxfrL1k0uIhcPFIYFtGQ9GG1?usp=sharing

Comment 5 Bug Janitor Service 2025-08-29 03:47:51 UTC

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!

Comment 6 kdesomeuser 2025-09-15 02:42:18 UTC

at v25.08.0 the problem is gone.