For example,
In the select branch that contains
datascope=size=1920x1080:x=45:y=340:mode=color2,not(eq(mod((n+1)\,5)\,3))
datascope appears for frames 0 1 3 4 5 6 8 9 10 11 13 14 15 16 18 19 etc.
whereas in the select branch that contains
datascope=size=1920x1080:x=45:y=340:mode=color2,eq(mod((n+1)\,5)\,3)
datascope appears solely for frames 2 7 12 17 etc.
That reveals that, though datascope is placed before the modulo filter and is therefore exposed to
the entire stream, only those frames that pass completely through the branch are 'scoped'.
Logically, datascope's 'scope' must be replacing the contents of the frames that pass through, not
the frames that don't pass through.
Do you agree, or am I mistaken?
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