The 'sidx' earliest_presentation_time field is defined as PTS. Previously, it 
was incorrectly assigned to DTS, which could cause sync issues. This commit 
fixes the assignment to PTS as noted in the existing FIXME comment.
---
 libavformat/mov.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 009ddfec80..f651d0387b 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -5892,9 +5892,9 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, 
MOVAtom atom)
             } else if (has_sidx && !c->use_tfdt || fallback_sidx) {
                 // FIXME: sidx earliest_presentation_time is *PTS*, s.b.
                 // pts = frag_stream_info->sidx_pts;
-                dts = frag_stream_info->sidx_pts;
+                pts = frag_stream_info->sidx_pts; // <--- FIXED
                 av_log(c->fc, AV_LOG_DEBUG, "found sidx time %"PRId64
-                        ", using it for dts\n", frag_stream_info->sidx_pts);
+                        ", using it for pts\n", frag_stream_info->sidx_pts); 
// Update log message too if you like, but logically just changing to pts is 
the key.
             } else {
                 dts = sc->track_end - sc->time_offset;
                 av_log(c->fc, AV_LOG_DEBUG, "found track end time %"PRId64
-- 
2.49.0.windows.1


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