From 00af143176658dabc993c617836903e9f8db55a8 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Fri, 31 Jan 2014 01:36:09 +0100
Subject: [PATCH] demux_lavf: fix crash with empty files

This used to work; I'm not sure when or why it regressed. When setting
AVProbeData.filename to NULL, libavformat will crash in rtp_probe() by
unconditionally accessing the string.

We used to set the filename to NULL to prevent probing by file extension
when we don't deem it as necessary. Using an empty string also works for
this purpose.
---
 demux/demux_lavf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/demux/demux_lavf.c b/demux/demux_lavf.c
index 67f8f9ff93..6c440bcb23 100644
--- a/demux/demux_lavf.c
+++ b/demux/demux_lavf.c
@@ -251,7 +251,7 @@ static int lavf_check_file(demuxer_t *demuxer, enum demux_check check)
 
     AVProbeData avpd = {
         // Disable file-extension matching with normal checks
-        .filename = check <= DEMUX_CHECK_REQUEST ? priv->filename : NULL,
+        .filename = check <= DEMUX_CHECK_REQUEST ? priv->filename : "",
         .buf_size = 0,
         .buf = av_mallocz(PROBE_BUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE),
     };