https://bugs.kde.org/show_bug.cgi?id=409159

            Bug ID: 409159
           Summary: Fade from black - effect jumps forward after trimming
                    and changing speed
           Product: kdenlive
           Version: 19.04.2
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: User Interface
          Assignee: j...@kdenlive.org
          Reporter: iticdig...@disroot.org
  Target Milestone: ---

SUMMARY
If you cut the beginning and end of the clip, add fade in black and fade from
black, then increase the speed to 150%, then the fade from black moves about 5
seconds ahead of the start. That is, the video will start without fade in but
then after some time it will darken and go again. 
Does not work on too short clips! It is necessary that the length of the clip
after acceleration was not less than 30 seconds.

STEPS TO REPRODUCE
1. Trim the beginning and end of the clip.
2. Add Fade From Black and Fade To black with dots in the corners of the clip
on the timeline.
3. Increase clip speed up to 150%

OBSERVED RESULT
Fade from black will not work where it should be, but in about 3 seconds the
video will darken for a short time.

EXPECTED RESULT
Obviously not this

SOFTWARE/OS VERSIONS
Ubuntu Studio 18.04.2 x64
kdenlive-19.04.2f-x86_64.appimage

Always happens

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