VAR_SR            641 libavfilter/af_firequalizer.c     vars[VAR_SR] = inlink->sample_rate;
VAR_SR            129 libavfilter/setpts.c     setpts->var_values[VAR_SR] =
VAR_SR             82 libavfilter/settb.c     settb->var_values[VAR_SR]   = inlink->sample_rate;