APNG_BLEND_OP_OVER  879 libavcodec/pngdec.c     if (s->blend_op == APNG_BLEND_OP_OVER &&
APNG_BLEND_OP_OVER  896 libavcodec/pngdec.c     if (s->dispose_op != APNG_DISPOSE_OP_BACKGROUND && s->blend_op == APNG_BLEND_OP_OVER) {