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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 decb66de75..7deccaaa74 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -1314,6 +1314,7 @@ static int mkv_check_tag_name(const char *name, unsigned int elementid)
av_strcasecmp(name, "stereo_mode") &&
av_strcasecmp(name, "creation_time") &&
av_strcasecmp(name, "encoding_tool") &&
+ av_strcasecmp(name, "duration") &&
(elementid != MATROSKA_ID_TAGTARGETS_TRACKUID ||
av_strcasecmp(name, "language"));
}