BLEND_AVERAGE     111 libavfilter/vf_blend.c     { "average",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AVERAGE},    0, 0, FLAGS, "mode" },\
BLEND_AVERAGE     320 libavfilter/vf_blend.c         case BLEND_AVERAGE:    param->blend = blend_average;    break;