av_add_stable    1136 libavformat/utils.c                 st->cur_dts = av_add_stable(st->time_base, pkt->pts, duration, 1);
av_add_stable     157 libavutil/mathematics.h int64_t av_add_stable(AVRational ts_tb, int64_t ts, AVRational inc_tb, int64_t inc);
av_add_stable     193 libavutil/rational.c                             acc = av_add_stable(a, acc, b, 1);