From a5832ba0194d278cb0813daf8b4af564e6848a61 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Tue, 30 Dec 2014 13:21:36 +0100
Subject: vf: fix crash if filter doesn't provide control entrypoint

This input command crashed:

    vf add @mf:format=yuv420p ; show_text "${vf-metadata/mf}"

Fixes #1408.
---
 video/filter/vf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/video/filter/vf.c b/video/filter/vf.c
index d3441febf1..a424cc5856 100644
--- a/video/filter/vf.c
+++ b/video/filter/vf.c
@@ -170,7 +170,7 @@ int vf_control_by_label(struct vf_chain *c,int cmd, void *arg, bstr label)
     char *label_str = bstrdup0(NULL, label);
     struct vf_instance *cur = vf_find_by_label(c, label_str);
     talloc_free(label_str);
-    if (cur)
+    if (cur && cur->control)
         return cur->control(cur, cmd, arg);
     else
         return CONTROL_UNKNOWN;
-- 
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