libavfilter: default to filter_frame when neither it nor start/slice/end is set.
this is needed for vf_null and a few others.
Signed-off-by:
Michael Niedermayer <michaelni@gmx.at>
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this is needed for vf_null and a few others.
Signed-off-by:
Michael Niedermayer <michaelni@gmx.at>