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diff --git a/libavformat/mov.c b/libavformat/mov.c
index 2810960..71c37c2 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2321,6 +2321,9 @@ static void mov_build_index(MOVContext *mov, AVStream *st)
if (sc->time_offset < 0)
sc->time_offset = av_rescale(sc->time_offset, sc->time_scale, mov->time_scale);
current_dts = -sc->time_offset;
+ if (sc->ctts_data && sc->ctts_count) {
+ current_dts -= sc->ctts_data[0].duration;
+ }
}
/* only use old uncompressed audio chunk demuxing when stts specifies it */
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