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-rw-r--r--libavformat/matroskaenc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 91da9079f4..60c304a5ed 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -225,6 +225,7 @@ static int mkv_write_header(AVFormatContext *s)
static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
{
ByteIOContext *pb = &s->pb;
+ offset_t block;
block = start_ebml_master(pb, MATROSKA_ID_SIMPLEBLOCK);
put_byte(pb, 0x80 | pkt->stream_index); // this assumes stream_index is less than 127