https://bugs.kde.org/show_bug.cgi?id=377191

            Bug ID: 377191
           Summary: Chroma key variance not working
           Product: kdenlive
           Version: git-master
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Effects & Transitions
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

At least in the last few versions of kdenlive, the variance in the chroma key
effect isn't working for me.

I finally got round to compiling kdenlive to try and find the issue, and found
that in the melt module filter_chroma.c the 

mlt_properties_get_double( MLT_FILTER_PROPERTIES( this ), "variance" )

always returns 0.

So, no matter what I set the variance too in the gui, it only matches the
precise pixel color.

For me the issue is resolved when changing kdenlive chroma.xml parameter type
from "constant" to "double".

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