BLEND_OVERLAY     125 libavfilter/vf_blend.c     { "overlay",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OVERLAY},    0, 0, FLAGS, "mode" },\
BLEND_OVERLAY     334 libavfilter/vf_blend.c         case BLEND_OVERLAY:    param->blend = blend_overlay;    break;