I think he probably meant something like this:
x=mpegsource("trallalaa")
y=x.trim(1,0)
conditionalfilter(x,x,y,"iscombed(threshold=14)","=","false")
Cause you can test the original version:
x=mpegsource("trallalaa")
y=x.trim(1,0)
conditionalfilter(x,x,y,"iscombed","<","14")
And it will always return x, since the result of iscombed is always less then 14.
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