CODEC_FLAG2_WPRED  271 libavcodec/libx264.c     x4->params.analyse.b_weighted_bipred = avctx->flags2 & CODEC_FLAG2_WPRED;
CODEC_FLAG2_WPRED  359 libavcodec/options.c {"wpred", "weighted biprediction for b-frames (H.264)", 0, FF_OPT_TYPE_CONST, CODEC_FLAG2_WPRED, INT_MIN, INT_MAX, V|E, "flags2"},