Bug 398434

Summary: Curves effect not reflecting changes but still processing video
Product: [Applications] kdenlive Reporter: Javier O. Cordero Pérez (Cuperino) <javiercorderoperez>
Component: Effects & TransitionsAssignee: Vincent PINON <vpinon>
Status: RESOLVED FIXED    
Severity: normal CC: cyberbeat, fritzibaby
Priority: NOR Flags: fritzibaby: Brainstorm+
Version: 19.04.2   
Target Milestone: ---   
Platform: Appimage   
OS: Linux   
Latest Commit: https://invent.kde.org/kde/kdenlive/commit/9f353c193f799d1ed0ddd5745e87b38f1832a6b3 Version Fixed In: nightly build
Attachments: Screenshot of the Curves effect with some settings applied.

Description Javier O. Cordero Pérez (Cuperino) 2018-09-09 17:53:02 UTC 
Created attachment 114864 [details]
Screenshot of the Curves effect with some settings applied.

Applying and messing the "Curves" effect has no effect on the image in any of the possible settings combinations. The effect still slows down playback, as if the image were being processed.

The "Show graph in picture" checkbox is the only setting to have an effect on the image. The graph that shows inside the picture shows a straight line within a transparent grid background, as if the changes to the curve were not being read.

On a side note, the similar "Bézier Curves" effect is working just fine.
Comment 1 emohr 2019-01-13 13:04:39 UTC 
confirmed, can reproduce it. Tested with Appimage Nightly build #50 12.Jan 19
Comment 2 H.H. 2019-06-09 20:39:13 UTC 
For me the curves affect produces a black picture in the preview pane. This bug is new with version 19.04
Comment 3 emohr 2019-06-10 10:15:08 UTC 
Confirmed. I opened issue: https://invent.kde.org/kde/kdenlive/issues/242 .

Workaround: use effect Bezier Curves.
Comment 5 H.H. 2019-06-13 20:01:44 UTC 
Great! Thanks!