AVDISCARD_NONE    342 libavcodec/options.c {"none"            , NULL, 0, FF_OPT_TYPE_CONST, AVDISCARD_NONE   , INT_MIN, INT_MAX, V|D, "avdiscard"},
AVDISCARD_NONE   2392 libavformat/utils.c         program->discard = AVDISCARD_NONE;