help-me-with-pi

root@raspberrypi:/etc# ffserver -f /etc/ffserver.conf & ffmpeg -v debug -r 5 -s 640x480 -f video4linux2 -i /dev/video0 http://localhost/webcam.ffm

With the above command line.
This is the output

[4] 8211
ffserver version 1.0.3 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jan 29 2013 18:26:25 with gcc 4.6 (Debian 4.6.3-14+rpi1)
  configuration:
  libavutil      51. 73.101 / 51. 73.101
  libavcodec     54. 59.100 / 54. 59.100
  libavformat    54. 29.104 / 54. 29.104
  libavdevice    54.  2.101 / 54.  2.101
  libavfilter     3. 17.100 /  3. 17.100
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 15.100 /  0. 15.100
bind(port 80): Address already in use
ffmpeg version 1.0.3 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jan 29 2013 18:26:25 with gcc 4.6 (Debian 4.6.3-14+rpi1)
  configuration:
  libavutil      51. 73.101 / 51. 73.101
  libavcodec     54. 59.100 / 54. 59.100
  libavformat    54. 29.104 / 54. 29.104
  libavdevice    54.  2.101 / 54.  2.101
  libavfilter     3. 17.100 /  3. 17.100
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 15.100 /  0. 15.100
[video4linux2,v4l2 @ 0x19b0620] [3]Capabilities: 4000001
[video4linux2,v4l2 @ 0x19b0620] The V4L2 driver set input_id: 0, input: Camera 1
[video4linux2,v4l2 @ 0x19b0620] Setting time per frame to 1/5
[video4linux2,v4l2 @ 0x19b0620] The driver changed the time per frame from 1/5 to 2/15
[video4linux2,v4l2 @ 0x19b0620] All info found
[video4linux2,v4l2 @ 0x19b0620] Estimating duration from bitrate, this may be inaccurate
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 520746.516788, bitrate: 36864 kb/s
    Stream #0:0, 1, 1/1000000: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 2/15, 36864 kb/s, 7.50 tbr, 1000k tbn, 7.50 tbc
[ffm @ 0x19b2760] Format ffm probed with size=2048 and score=101
[AVIOContext @ 0x19b0500] Statistics: 4096 bytes read, 0 seeks
Missing audio stream which is required by this ffm
[4]+  Exit 1                  ffserver -f /etc/ffserver.conf