CHECK_RADIUS_VAL  192 libavfilter/vf_boxblur.c     CHECK_RADIUS_VAL(w,  h,  luma);
CHECK_RADIUS_VAL  193 libavfilter/vf_boxblur.c     CHECK_RADIUS_VAL(cw, ch, chroma);
CHECK_RADIUS_VAL  194 libavfilter/vf_boxblur.c     CHECK_RADIUS_VAL(w,  h,  alpha);