FF_API_AVFILTER_OPEN 1024 extra_lib/include/libavfilter/avfilter.h #if FF_API_AVFILTER_OPEN
FF_API_AVFILTER_OPEN 1277 extra_lib/include/libavfilter/avfilter.h #if FF_API_AVFILTER_OPEN
FF_API_AVFILTER_OPEN   73 extra_lib/include/libavfilter/version.h #ifndef FF_API_AVFILTER_OPEN