Hi. When I use filter_complex syntax below, I get an error that cannot proceed. "-filter_complex "[1:v]geq=r='r(X,Y)':a='if(between(t,0,9),alpha(X,Y),0)'[alpha];" then " Unknown function in 't,0,9),alpha(X,Y),0)'" Seems geq filter not support generic function parsing. Please look into it.
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