diff --git a/libavformat/mov.c b/libavformat/mov.c
index 370fbc8e78..63fb813654 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2000,8 +2000,10 @@ static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     if (!entries)
         return 0;
 
-    if (sc->chunk_offsets)
-        av_log(c->fc, AV_LOG_WARNING, "Duplicated STCO atom\n");
+    if (sc->chunk_offsets) {
+        av_log(c->fc, AV_LOG_WARNING, "Ignoring duplicated STCO atom\n");
+        return 0;
+    }
     av_free(sc->chunk_offsets);
     sc->chunk_count = 0;
     sc->chunk_offsets = av_malloc_array(entries, sizeof(*sc->chunk_offsets));
@@ -2647,8 +2649,10 @@ static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 
     if (!entries)
         return 0;
-    if (sc->stsc_data)
-        av_log(c->fc, AV_LOG_WARNING, "Duplicated STSC atom\n");
+    if (sc->stsc_data) {
+        av_log(c->fc, AV_LOG_WARNING, "Ignoring duplicated STSC atom\n");
+        return 0;
+    }
     av_free(sc->stsc_data);
     sc->stsc_count = 0;
     sc->stsc_data = av_malloc_array(entries, sizeof(*sc->stsc_data));