From 3862ebba23cc9a76a004edd4c12d0b853a0426cd Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sun, 1 May 2011 22:40:01 +0200
Subject: [PATCH] AVOptions: av_set_string3() allow NULL strings Signed-off-by:
 Michael Niedermayer <michaelni@gmx.at>

---
 libavutil/opt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavutil/opt.c b/libavutil/opt.c
index 5705b40490..720ad99e8e 100644
--- a/libavutil/opt.c
+++ b/libavutil/opt.c
@@ -119,7 +119,7 @@ int av_set_string3(void *obj, const char *name, const char *val, int alloc, cons
         *o_out = o;
     if (!o)
         return AVERROR_OPTION_NOT_FOUND;
-    if (!val || o->offset<=0)
+    if ((!val && o->type != FF_OPT_TYPE_STRING) || o->offset<=0)
         return AVERROR(EINVAL);
 
     if (o->type == FF_OPT_TYPE_BINARY) {