EVAL_RADIUS_EXPR  170 libavfilter/vf_boxblur.c     EVAL_RADIUS_EXPR(luma);
EVAL_RADIUS_EXPR  171 libavfilter/vf_boxblur.c     EVAL_RADIUS_EXPR(chroma);
EVAL_RADIUS_EXPR  172 libavfilter/vf_boxblur.c     EVAL_RADIUS_EXPR(alpha);