diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c index 82b8960848..f4233066c2 100644 --- a/libavformat/matroskadec.c +++ b/libavformat/matroskadec.c @@ -1631,7 +1631,15 @@ static int matroska_parse_cluster(MatroskaDemuxContext *matroska) MatroskaCluster cluster = { 0 }; EbmlList *blocks_list; MatroskaBlock *blocks; - int i, res = ebml_parse(matroska, matroska_clusters, &cluster); + int i, res; + if (matroska->has_cluster_id){ + /* For the first cluster we parse, it's ID was already read as + part of matroska_read_header(), so don't read it again */ + res = ebml_parse_id(matroska, matroska_clusters, + MATROSKA_ID_CLUSTER, &cluster); + matroska->has_cluster_id = 0; + } else + res = ebml_parse(matroska, matroska_clusters, &cluster); blocks_list = &cluster.blocks; blocks = blocks_list->elem; for (i=0; !res && inb_elem; i++)