[PR] avformat/mov: don't overwrite stream duration with stts values (PR #23674)

PR #23674 opened by James Almer (jamrial)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23674
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23674.patch

The mdhd box duration value takes precedence, and the sum of all stts durations is not valid on video tracks with B frames.

Fixes issue #23670


>From 1fffd7f172bdea994a7b6f139ea0e67c44e19870 Mon Sep 17 00:00:00 2001
From: James Almer <[email protected]>
Date: Wed, 1 Jul 2026 12:27:42 -0300
Subject: [PATCH] avformat/mov: don't overwrite stream duration with stts
 values

The mdhd box duration value takes precedence, and the sum of all stts durations is
not valid on video tracks with B frames.

Fixes issue #23670

Signed-off-by: James Almer <[email protected]>
---
 libavformat/mov.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 90b01f9499..313614025c 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -3768,8 +3768,8 @@ static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     }
 
     st->nb_frames= total_sample_count;
-    if (duration)
-        st->duration= FFMIN(st->duration, duration);
+    if (!st->duration)
+        st->duration = duration;
 
     // All samples have zero duration. They have higher chance be chose by
     // mov_find_next_sample, which leads to seek again and again.
-- 
2.52.0

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