CELT_POSTFILTER_MINPERIOD  255 libavcodec/opus_celt.c                 block->pf_period_new = FFMAX(period, CELT_POSTFILTER_MINPERIOD);
CELT_POSTFILTER_MINPERIOD  312 libavcodec/opusenc.c         block->pf_period_new = FFMAX(period, CELT_POSTFILTER_MINPERIOD);