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-rw-r--r--libavformat/movenc.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 446c1ad2ee..78ff4ee8ac 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -3495,7 +3495,8 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
/* We also may have written the pts and the corresponding duration
* in sidx/tfrf/tfxd tags; make sure the sidx pts and duration match up with
* the next fragment. This means the cts of the first sample must
- * be the same in all fragments. */
+ * be the same in all fragments, unless end_pts was updated by
+ * the packet causing the fragment to be written. */
if ((mov->flags & FF_MOV_FLAG_DASH && !(mov->flags & FF_MOV_FLAG_GLOBAL_SIDX)) ||
mov->mode == MODE_ISM)
pkt->pts = pkt->dts + trk->end_pts - trk->cluster[trk->entry].dts;