avfilter/vf_dctdnoiz: Check threads
Fixes: floating point division by 0
Fixes: Ticket 8269
Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc>
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Fixes: floating point division by 0
Fixes: Ticket 8269
Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc>