From 0d6c07329e6a1764bd135b7b30cccba76d14e6cb Mon Sep 17 00:00:00 2001
From: Limin Wang <lance.lmwang@gmail.com>
Date: Thu, 10 May 2007 10:14:42 +0000
Subject: [PATCH] Allow avoid setting the video standard and input when
 capturing v4l2 video. Patch by Limin Wang, edited by me

Originally committed as revision 8971 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/v4l2.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/v4l2.c b/libavformat/v4l2.c
index aeaac33472..060d30a94d 100644
--- a/libavformat/v4l2.c
+++ b/libavformat/v4l2.c
@@ -429,6 +429,7 @@ static int v4l2_set_parameters( AVFormatContext *s1, AVFormatParameters *ap )
     struct v4l2_standard standard;
     int i;
 
+    if(ap->channel>=0) {
     /* set tv video input */
     memset (&input, 0, sizeof (input));
     input.index = ap->channel;
@@ -444,7 +445,9 @@ static int v4l2_set_parameters( AVFormatContext *s1, AVFormatParameters *ap )
             ap->channel);
         return AVERROR_IO;
     }
+    }
 
+    if(ap->standard) {
     av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
            ap->standard );
     /* set tv standard */
@@ -469,6 +472,7 @@ static int v4l2_set_parameters( AVFormatContext *s1, AVFormatParameters *ap )
             ap->standard);
         return AVERROR_IO;
     }
+    }
 
     return 0;
 }