prevent segfault when passed no arguments

Originally committed as revision 1558 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 1 insertions, 1 deletions

diff --git a/vhook/imlib2.c b/vhook/imlib2.c
index 64b1bae687..6c6707b78b 100644
--- a/vhook/imlib2.c
+++ b/vhook/imlib2.c
@@ -249,7 +249,7 @@ void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width,
             }
         }
 
-        strftime(buff, sizeof(buff), tbp, localtime(&now));
+        strftime(buff, sizeof(buff), tbp ? tbp : "[No data]", localtime(&now));
 
         x = ci->x;
         y = ci->y;