Raspberry ffmpeg error

root@raspberrypi:/usr/sbin# uname -a
Linux raspberrypi 3.2.27+ #102 PREEMPT Sat Sep 1 01:00:50 BST 2012 armv6l GNU/Linux

root@raspberrypi:/usr/sbin# ls -l /dev/ |grep vid
crw-rw---T 1 root video    29,   0 Jan  1  1970 fb0
crw-rw---T 1 root video   252,   0 Jan  1  1970 vchiq
crw-rw---T 1 root video    81,   0 Sep 18 04:37 video0

root@raspberrypi:/usr/sbin# sudo /usr/sbin/webcam.sh
ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Sep 17 2012 09:03:41 with gcc 4.6.3
ffserver version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Sep 17 2012 09:03:41 with gcc 4.6.3
  configuration:
  libavutil      51. 54.100 / 51. 54.100
  libavcodec     54. 23.100 / 54. 23.100
  libavformat    54.  6.100 / 54.  6.100
  configuration:
  libavutil      51. 54.100 / 51. 54.100
  libavcodec     54. 23.100 / 54. 23.100
  libavformat    54.  6.100 / 54.  6.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     2. 77.100 /  2. 77.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     2. 77.100 /  2. 77.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
[video4linux2,v4l2 @ 0x1466520] [3]Capabilities: 4000001
bind(port 80): Address already in use
[video4linux2,v4l2 @ 0x1466520] ioctl(VIDIOC_DQBUF): Input/output error
[video4linux2,v4l2 @ 0x1466520] Estimating duration from bitrate, this may be inaccurate
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, bitrate: 6144 kb/s
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 320x240, 6144 kb/s, 5 tbr, 1000k tbn, 5 tbc
[buffer @ 0x14664c0] w:320 h:240 pixfmt:yuyv422 tb:1/1000000 sar:0/1 sws_param:flags=2
[buffersink @ 0x1468900] No opaque field provided
[scale @ 0x146ae20] w:320 h:240 fmt:yuyv422 sar:0/1 -> w:640 h:480 fmt:yuvj422p sar:0/1 flags:0x4
Output #0, ffm, to 'http://localhost/webcam.ffm':
  Metadata:
    encoder         : Lavf54.6.100
    Stream #0:0: Video: mjpeg, yuvj422p, 640x480, q=1-10, 2000 kb/s, 1000k tbn, 5 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> mjpeg)
Press [q] to stop, [?] for help
[video4linux2,v4l2 @ 0x1466520] ioctl(VIDIOC_DQBUF): No such device
frame=    0 fps=0.0 q=0.0 Lsize=       4kB time=00:00:00.00 bitrate=   0.0kbits/s
video:0kB audio:0kB global headers:0kB muxing overhead inf%
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)