From dbafb0e06faa092f60e53d845957fbab7f2a3f2d Mon Sep 17 00:00:00 2001
From: "Ronald S. Bultje" <rsbultje@gmail.com>
Date: Sat, 18 Jun 2011 15:33:49 -0400
Subject: [PATCH] lavf: prevent crash in av_open_input_file() if ap == NULL.

Needed for proper behaviour in our old API compatibility code.
---
 libavformat/utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/utils.c b/libavformat/utils.c
index 81bc9b70c3..7370c60bdf 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -549,7 +549,7 @@ int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
     int err;
     AVDictionary *opts = convert_format_parameters(ap);
 
-    if (!ap->prealloced_context)
+    if (!ap || !ap->prealloced_context)
         *ic_ptr = NULL;
 
     err = avformat_open_input(ic_ptr, filename, fmt, &opts);