CDG_PACKET_SIZE    52 libavformat/cdg.c         vst->duration = (ret * vst->time_base.den) / (CDG_PACKET_SIZE * 300);
CDG_PACKET_SIZE    63 libavformat/cdg.c         ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE);
CDG_PACKET_SIZE    76 libavformat/cdg.c     pkt->pts= pkt->pos / CDG_PACKET_SIZE;