CODEC_FLAG2_MIXED_REFS  291 libavcodec/libx264.c     x4->params.analyse.b_mixed_references = avctx->flags2 & CODEC_FLAG2_MIXED_REFS;
CODEC_FLAG2_MIXED_REFS  360 libavcodec/options.c {"mixed_refs", "one reference per partition, as opposed to one reference per macroblock", 0, FF_OPT_TYPE_CONST, CODEC_FLAG2_MIXED_REFS, INT_MIN, INT_MAX, V|E, "flags2"},