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-rw-r--r--libavformat/matroska.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libavformat/matroska.h b/libavformat/matroska.h
index 769fe5445a..8e6f8cc339 100644
--- a/libavformat/matroska.h
+++ b/libavformat/matroska.h
@@ -118,6 +118,7 @@
#define MATROSKA_ID_VIDEODISPLAYUNIT 0x54B2
#define MATROSKA_ID_VIDEOFLAGINTERLACED 0x9A
#define MATROSKA_ID_VIDEOSTEREOMODE 0x53B8
+#define MATROSKA_ID_VIDEOALPHAMODE 0x53C0
#define MATROSKA_ID_VIDEOASPECTRATIO 0x54B3
#define MATROSKA_ID_VIDEOCOLORSPACE 0x2EB524