diff --git a/ffmpeg.c b/ffmpeg.c
index 9aa094ead1..d0124e7efb 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -2117,7 +2117,7 @@ static int transcode_init(void)
     AVCodecContext *codec;
     OutputStream *ost;
     InputStream *ist;
-    char error[1024];
+    char error[1024] = {0};
     int want_sdp = 1;
 
     for (i = 0; i < nb_filtergraphs; i++) {