diff --git a/libavformat/mov.c b/libavformat/mov.c
index f33a5ac555..01c9413759 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2232,8 +2232,9 @@ static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)
                                              ((double)st->codec->width * sc->height), INT_MAX);
         }
 
-        av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
-                  sc->time_scale*st->nb_frames, st->duration, INT_MAX);
+        if (st->duration > 0)
+            av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
+                    sc->time_scale*st->nb_frames, st->duration, INT_MAX);
 
 #if FF_API_R_FRAME_RATE
         if (sc->stts_count == 1 || (sc->stts_count == 2 && sc->stts_data[1].count == 1))