Yes i know.
In order to load a preset with multiple filter preset is not possible yet. Below is the preset from Colour Grading:
lift_r: -0.468986
lift_g: -0.120989
lift_b: 1.5259e-05
gamma_r: 1.21401
gamma_g: 1.21401
gamma_b: 1.21401
gain_r: 1.10668
gain_g: 1.10668
gain_b: 1.10668
…
As we can see, there’s no identifier to call the filters. If i put another preset below the colour grading preset, that will make it even harder to call the right filter. For example:
Colour_Grading Filter
lift_r: -0.468986
lift_g: -0.120989
lift_b: 1.5259e-05
gamma_r: 1.21401
gamma_g: 1.21401
gamma_b: 1.21401
gain_r: 1.10668
gain_g: 1.10668
gain_b: 1.10668
White_Balance Filter
“#7f7f7f”
0.358753
…
In order to call the right filter, Shotcut need to add a new func to read the code from a single preset and call the right filters wihtout inserting the filter itself. From the road map, that is not in the list. Maybe someday if people up vote the function.
A good work around is to use @bentacular tips on using MLT template.