diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index 9e076e89da..378c9ccac4 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -1636,12 +1636,16 @@ static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));

         if (s1->a53_caption) {
-            AVFrameSideData *sd = av_frame_new_side_data(
-                s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
-                s1->a53_caption_size);
-            if (sd)
-                memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
-            av_freep(&s1->a53_caption);
+            AVBufferRef *buf = av_buffer_create(s1->a53_caption, s1->a53_caption_size, NULL, NULL, 0);
+            if (buf) {
+                AVFrameSideData *sd = av_frame_new_side_data_from_buf(s->current_picture_ptr->f,
+                                                                      AV_FRAME_DATA_A53_CC, buf);
+                if (!sd)
+                    av_buffer_unref(&buf);
+            } else
+                av_free(s1->a53_caption);
+            s1->a53_caption = NULL;
+            s1->a53_caption_size = 0;
         }

         if (s1->has_stereo3d) {