1 files changed, 2 insertions, 1 deletions
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index b9f99c4..06f3aeb 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -2534,7 +2534,8 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
     // buffer an audio packet to ensure the packet containing the video
     // keyframe's timecode is contained in the same cluster for WebM
     if (codec_type == AVMEDIA_TYPE_AUDIO) {
-        ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
+        if (pkt->size > 0)
+            ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
     } else
         ret = mkv_write_packet_internal(s, pkt, 0);
     return ret;