VAR_OVSUB          80 libavfilter/scale_eval.c     var_values[VAR_OVSUB] = 1 << out_desc->log2_chroma_h;
VAR_OVSUB         437 libavfilter/vf_scale.c     scale->var_values[VAR_OVSUB] = 1 << out_desc->log2_chroma_h;
VAR_OVSUB         220 libavfilter/vf_zscale.c     var_values[VAR_OVSUB] = 1 << out_desc->log2_chroma_h;