diff --git a/ffmpeg.c b/ffmpeg.c
index 840c6214d38f720208540751f087b2565d21b706..0741eca2614de9487d55dd52543d20257f7d5503 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -2542,7 +2542,7 @@ static int transcode_init(void)
     AVFormatContext *oc;
     OutputStream *ost;
     InputStream *ist;
-    char error[1024];
+    char error[1024] = {0};
     int want_sdp = 1;
 
     for (i = 0; i < nb_filtergraphs; i++) {