Undefined symbols for architecture x86_64:
"_pp_free_context", referenced from:
_pp_uninit in libavfilter.a(vf_pp.o)
"_pp_free_mode", referenced from:
_pp_uninit in libavfilter.a(vf_pp.o)
"_pp_get_context", referenced from:
_pp_config_props in libavfilter.a(vf_pp.o)
"_pp_get_mode_by_name_and_quality", referenced from:
_pp_init in libavfilter.a(vf_pp.o)
"_pp_postprocess", referenced from:
_pp_filter_frame in libavfilter.a(vf_pp.o)
ld: symbol(s) not found for architecture x86_64
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