Fixes CID1231992

Suggested-by: Timothy Gu <timothyg...@gmail.com>
Signed-off-by: Michael Niedermayer <michae...@gmx.at>
---
 libavformat/matroskaenc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 7123ec6..98fe4af 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -874,8 +874,8 @@ static int mkv_write_track(AVFormatContext *s, 
MatroskaMuxContext *mkv,
             }
         }
 
-        if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
-            (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
+        if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && 
atoi(tag->value)) ||
+            ((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && 
atoi(tag->value)) ||
             (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
             put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
         }
-- 
1.7.9.5

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