From c9ae8be5a87ce6fc6cd3ddc5ac590c0245dc8928 Mon Sep 17 00:00:00 2001
From: Michael Bradshaw <mjbshaw@google.com>
Date: Tue, 26 Jul 2016 10:18:43 -0700
Subject: [PATCH] avformat/matroskaenc: fix Voids with size < 10

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/matroskaenc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index f8dfa1cb72..2a2877fd68 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -280,7 +280,7 @@ static void put_ebml_void(AVIOContext *pb, uint64_t size)
     // size we need to reserve so 2 cases, we use 8 bytes to store the
     // size if possible, 1 byte otherwise
     if (size < 10)
-        put_ebml_num(pb, size - 1, 0);
+        put_ebml_num(pb, size - 2, 0);
     else
         put_ebml_num(pb, size - 9, 8);
     ffio_fill(pb, 0, currentpos + size - avio_tell(pb));