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-rw-r--r--libavformat/mxfenc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libavformat/mxfenc.c b/libavformat/mxfenc.c
index 51ed2122df..5e77a3f068 100644
--- a/libavformat/mxfenc.c
+++ b/libavformat/mxfenc.c
@@ -1660,7 +1660,7 @@ static void mxf_gen_umid(AVFormatContext *s)
AV_WB64(mxf->umid , umid);
AV_WB64(mxf->umid+8, umid>>8);
- mxf->instance_number = seed;
+ mxf->instance_number = seed & 0xFFFFFF;
}
static int mxf_write_header(AVFormatContext *s)