From afcde6551c70ff750ed0635be61a6e779c2ed949 Mon Sep 17 00:00:00 2001
From: Nicolas Gaullier <nicolas.gaullier@cji.paris>
Date: Fri, 19 Dec 2025 18:10:26 +0100
Subject: [PATCH] avformat/mov: fix skip_samples when sample_rate and time_base
 do not match

Fixes #21076.
---
 libavformat/mov.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index c8eb95564e..56d4a11214 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -4759,7 +4759,8 @@ static void mov_build_index(MOVContext *mov, AVStream *st)
 
         if (!multiple_edits && !mov->advanced_editlist &&
             st->codecpar->codec_id == AV_CODEC_ID_AAC && start_time > 0)
-            sc->start_pad = start_time;
+            sc->start_pad = av_rescale_q(start_time, st->time_base,
+                    (AVRational){1, st->codecpar->sample_rate});
     }
 
     /* only use old uncompressed audio chunk demuxing when stts specifies it */