EBML_STOP leaves matroska->current_id set. Then matroska_read_seek changes the stream position without resetting
current_id. The next matroska_parse_cluster fails due to calculation of incorrect pos. So clear current_id when
avio_seek happens in matroska_read_seek.
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 57a8f62..60f6c69 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1903,6 +1903,7 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
avio_seek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
+ matroska->current_id = 0;
while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
matroska_clear_queue(matroska);
if (matroska_parse_cluster(matroska) < 0)
@@ -1931,6 +1932,7 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
}
avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
+ matroska->current_id = 0;
matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
matroska->skip_to_timecode = st->index_entries[index].timestamp;
matroska->done = 0;
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