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-rw-r--r--libavformat/avformat.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index eb5a965bce..7cc059c30a 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -119,6 +119,7 @@ struct AVFormatContext;
#define AV_METADATA_IGNORE_SUFFIX 2
#define AV_METADATA_DONT_STRDUP_KEY 4
#define AV_METADATA_DONT_STRDUP_VAL 8
+#define AV_METADATA_DONT_OVERWRITE 16 ///< Don't overwrite existing tags.
typedef struct {
char *key;