https://bugs.kde.org/show_bug.cgi?id=388558

            Bug ID: 388558
           Summary: "Fade to/from Black" + "Speed" effects cause "Fade
                    to/from Black" duplicates and change parameter values
           Product: kdenlive
           Version: 17.12.0
          Platform: Manjaro
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Effects & Transitions
          Assignee: vpi...@kde.org
          Reporter: yakovassemb...@gmail.com
  Target Milestone: ---

Created attachment 109690
  --> https://bugs.kde.org/attachment.cgi?id=109690&action=edit
The example project and the screenshot

I have faced a strange behaviour of "Fade to/from Black" and "Speed" effects,
when they are applied together to the same clip. "Fade" effects duplicates
appear, and time values are changed to wrong numbers.

Steps:
1) Create a new project.
2) Add a clip on the timeline (I have used "Plasma browser integration" from
YouTube (720p, MP4) as an example.
3) Add "Fade to Black" and "Fade from Black" effects, don't change default
values (however, if they are changed to custom, the error appears too. Just as
a precaution)
4) Add speed effect, set to 200%.
5) Save the project.
6) Reopen it.
7) Check clip effects and their parameters. There will be one extra "Fade to
Black" effect, and maybe other "Fade" effects parameters will be changed.

As I have noticed, mostly "Fade to Black" is duplicated with a strange
parameter, and sometimes "Fade from Black" changes its value too.

I have attached an example project (without a video, you can find it on
YouTube) and a screenshot.

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