From bd7d9e45a44480da09e956b55e93f455cf1ed26c Mon Sep 17 00:00:00 2001
From: Stefano Sabatini <stefano.sabatini-lala@poste.it>
Date: Tue, 4 Jan 2011 18:18:01 +0000
Subject: [PATCH] In the video4linux2 output device, log an error description
 in case of ioctl failure in mmap_release_buffer().

Originally committed as revision 26214 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavdevice/v4l2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c
index 035e41633d..54259284af 100644
--- a/libavdevice/v4l2.c
+++ b/libavdevice/v4l2.c
@@ -324,7 +324,7 @@ static void mmap_release_buffer(AVPacket *pkt)
 
     res = ioctl(fd, VIDIOC_QBUF, &buf);
     if (res < 0) {
-        av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n");
+        av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno));
     }
     pkt->data = NULL;
     pkt->size = 0;