if (trk->start_dts == AV_NOPTS_VALUE) {
trk->start_dts = pkt->dts;
if (trk->frag_discont) {
- /* Pretend the whole stream started at dts=0, with earlier fragments
- * already written, with a duration summing up to pkt->dts. */
- trk->frag_start = pkt->dts;
- trk->start_dts = 0;
+ if (mov->use_editlist) {
+ /* Pretend the whole stream started at pts=0, with earlier fragments
+ * already written. If the stream started at pts=0, the duration sum
+ * of earlier fragments would have been pkt->pts. */
+ trk->frag_start = pkt->pts;
+ trk->start_dts = pkt->dts - pkt->pts;
+ } else {
+ /* Pretend the whole stream started at dts=0, with earlier fragments
+ * already written, with a duration summing up to pkt->dts. */
+ trk->frag_start = pkt->dts;
+ trk->start_dts = 0;
+ }
trk->frag_discont = 0;
} else if (pkt->dts && mov->moov_written)
av_log(s, AV_LOG_WARNING,