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-rw-r--r--libavformat/matroskadec.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index a0e259c3b5..442a5a013a 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1640,6 +1640,7 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
matroska_fix_ass_packet(matroska, pkt, duration);
if (matroska->prev_pkt &&
+ timecode != AV_NOPTS_VALUE &&
matroska->prev_pkt->pts == timecode &&
matroska->prev_pkt->stream_index == st->index)
matroska_merge_packets(matroska->prev_pkt, pkt);