ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinha...@gmail.com> | 
Tue Nov 26 04:40:29 2019 +0100| [5d24b6843ca548508187d48bf587ae5ecbcffd57] | 
committer: Andreas Rheinhardt

avformat/matroskaenc: Check that Cluster has been opened

before setting the field indicating that a Cluster has been opened.

Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5d24b6843ca548508187d48bf587ae5ecbcffd57
---

 libavformat/matroskaenc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 1491010bcc..5dae53026d 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -2311,10 +2311,10 @@ static int mkv_write_packet_internal(AVFormatContext 
*s, AVPacket *pkt, int add_
     }
 
     if (mkv->cluster_pos == -1) {
-        mkv->cluster_pos = avio_tell(s->pb);
         ret = start_ebml_master_crc32(&mkv->cluster_bc, mkv);
         if (ret < 0)
             return ret;
+        mkv->cluster_pos = avio_tell(s->pb);
         put_ebml_uint(mkv->cluster_bc, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, 
ts));
         mkv->cluster_pts = FFMAX(0, ts);
         av_log(s, AV_LOG_DEBUG,

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