BLEND_DIFFERENCE  114 libavfilter/vf_blend.c     { "difference", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIFFERENCE}, 0, 0, FLAGS, "mode" },\
BLEND_DIFFERENCE  323 libavfilter/vf_blend.c         case BLEND_DIFFERENCE: param->blend = blend_difference; break;