PNG_FILTER_VALUE_UP  277 libavcodec/pngdec.c     case PNG_FILTER_VALUE_UP:
PNG_FILTER_VALUE_UP  177 libavcodec/pngenc.c     case PNG_FILTER_VALUE_UP:
PNG_FILTER_VALUE_UP 1119 libavcodec/pngenc.c         { "up",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_UP },    INT_MIN, INT_MAX, VE, "pred" },