av_rescale_delta 1752 ffmpeg.c               opkt.dts = opkt.pts = av_rescale_delta(ist->st->time_base, pkt->dts,
av_rescale_delta 1920 ffmpeg.c               decoded_frame->pts = av_rescale_delta(decoded_frame_tb, decoded_frame->pts,
av_rescale_delta  144 libavutil/mathematics.h int64_t av_rescale_delta(AVRational in_tb, int64_t in_ts,  AVRational fs_tb, int duration, int64_t *last, AVRational out_tb);