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-rw-r--r--libavformat/matroskaenc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 7f0c6637a0..e13be953b2 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -191,7 +191,7 @@ static int mkv_write_header(AVFormatContext *s)
for (j = 0; j < 2; j++) {
for (k = 0; k < header_len[j] / 255; k++)
put_byte(pb, 255);
- put_byte(pb, header_len[j]);
+ put_byte(pb, header_len[j] % 255);
}
for (j = 0; j < 3; j++)
put_buffer(pb, header_start[j], header_len[j]);