PREROLL_TIME      330 libavformat/asfenc.c         avio_wl64(pb, pres_time + PREROLL_TIME * 10000); // presentation time
PREROLL_TIME      367 libavformat/asfenc.c     duration       = asf->duration + PREROLL_TIME * 10000;
PREROLL_TIME      404 libavformat/asfenc.c     avio_wl64(pb, PREROLL_TIME); /* start time stamp */
PREROLL_TIME      838 libavformat/asfenc.c             put_payload_header(s, stream, timestamp + PREROLL_TIME,
PREROLL_TIME      935 libavformat/asfenc.c     start_sec = (int)((PREROLL_TIME * 10000 + pts + ASF_INDEXED_INTERVAL - 1)