Compare Effect / Split view - help to debug

[Camille]

Hi all,

I got a strange/buggy behavior with the split view feature (that allows 
you to split your screen: half with effects on/half with effects off).

Here are the steps to reproduce the problem:

1 - Create a new project

2 - Add to the bin a footage that contains audio+video

3 - Add the footage to the timeline

4 - Add the Colorize effect to the clip on the timeline (tried with 
different effects, like greyscale,

5 - Place the playhead inside the clip on the timeline. In the monitor, 
the clip should appear blueish

6 - Click on the Compare Effect icon  in the properties panel (at the 
top of the effect stack applied to the clip).

Expected result :

In the monitor, half of  the clip is blueish, half has the natural colors.

Actual resut :

In the monitor, the clip has the natural colors, as if the effect had 
been disabled. But if you hover on the monitor, you can see the 
draggable red line and "Effect"  label.

But, if you do the same steps, but only apply the effect to the video 
part it works as expected

1 - Create a new project

2 - Add to the bin a footage that contains audio+video

3 - Add the footage to the timeline

4 - Add the Colorize effect to the clip on the timeline (tried with 
different effects, like greyscale,

5- Right click on the clip on the timeline, choose Ungroup.

6 - Click on the audio part, and press "Delete"

5 - Place the playhead inside the clip on the timeline. In the monitor, 
the clip should appear blueish

6 - Select your video clip in the timeline

7 - Click on the Compare Effect icon  in the properties panel (at the 
top of the effect stack applied to the clip).

Result :

As expected, in the monitor, half of  the clip is blueish, half has the 
natural colors.

I observe the same behavior with the following 5 different configurations:

- Ubuntu 19.04,

- Kdenlive, Version 19.04.3 (rev. 6657c4f62 - compiled from sources), 
MLT version 6.15.0, KDE Frameworks 5.56.0, Qt 5.12.2

- kdenlive-19.11.80-afafd1f-x86_64.appimage, MLT version 6.17.0, KDE 
Frameworks 5.61.0, Qt 5.12.4

- Ubuntu 19.10,

- Kdenlive Version 19.11.80 (rev. 8d8887b57 compiled from source), MLT 
version 6.16.0, KDE Frameworks 5.62.0, Qt 5.12.4 - 
kdenlive-19.11.80-afafd1f-x86_64.appimage, MLT version 6.17.0, KDE 
Frameworks 5.61.0, Qt 5.12.4

- kdenlive-19.08.1-x86_64.appimage, MLT version 6.17.0, KDE Frameworks 
5.61.0, Qt 5.12.4

Does anyone else encounter the same problem?

Thanks !

Camille

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