[Cin] FFmpeg 4.2 new filters

[Phyllis Smith]

> - Colorhold makes everything monochrome, even the color I chose to keep.
>
Finally managed to test *Colorhold*.  The way to get it to work is to use
the color picker in the Compositor to get an exact hex value number on a
specific spot.  Use this for the "color" value.  Then you can use
"similarity" or "blend" slider to expand that particular color to color
values that are numerically close.

- Dedot, no matter how much you change the parameters, shows no difference.
>
- Maskfun shows no difference.
> - tpad do not understand how it works
>
I did not understand any of these so did not test.

>
>
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