./ffmpeg -f rawvideo -pix_fmt rgb565 -s 800X640 -vcodec rawvideo -preset slow -i /dev/graphics/fb0 http://localhost:8090/feed1.ffm

ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jun 18 2012 15:09:13 with gcc 4.4.3
  configuration: --enable-version3 --disable-pthreads --enable-libx264 --disable-yasm --disable-asm --enable-gpl --enable-nonfree --disable-doc --enable-small --target-os=linux --disable-debug --disable-stripping --enable-cross-compile --cross-prefix=/home/rohit/Downloads/android-ndk-r7b/toolchains/x86-4.4.3/prebuilt/linux-x86/bin/i686-android-linux- --sysroot=/home/rohit/Downloads/android-ndk-r7b/platforms/android-9/arch-x86 --arch=x86 --extra-cflags=-I/home/rohit/android-ec2/streamserver/newffmpeg/libs/x264-snapshot-20120616-2245/ --extra-ldflags=-L/home/rohit/android-ec2/streamserver/newffmpeg/libs/x264-snapshot-20120616-2245/
  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
  libpostproc    52.  0.100 / 52.  0.100
[rawvideo @ 0x8c2ab70] Warning: not compiled with thread support, using thread emulation
[rawvideo @ 0x8c1c620] Estimating duration from bitrate, this may be inaccurate
Input #0, rawvideo, from '/dev/graphics/fb0':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (RGB[16] / 0x10424752), rgb565le, 800x640, 25 tbr, 25 tbn, 25 tbc
[buffer @ 0x8c1be50] w:800 h:640 pixfmt:rgb565le tb:1/25 sar:0/1 sws_param:flags=2
[buffersink @ 0x8c1bf80] No opaque field provided
[scale @ 0x8c1c110] w:800 h:640 fmt:rgb565le sar:0/1 -> w:800 h:640 fmt:yuv420p sar:0/1 flags:0x4
[libx264 @ 0x8c1b7a0] Warning: not compiled with thread support, using thread emulation
[libx264 @ 0x8c1b7a0] broken ffmpeg default settings detected
[libx264 @ 0x8c1b7a0] use an encoding preset (e.g. -vpre medium)
[libx264 @ 0x8c1b7a0] preset usage: -vpre <speed> -vpre <profile>
[libx264 @ 0x8c1b7a0] speed presets are listed in x264 --help
[libx264 @ 0x8c1b7a0] profile is optional; x264 defaults to high
Output #0, ffm, to 'http://localhost:8090/feed1.ffm':
    Stream #0:0: Video: h264, yuv420p, 800x640, q=2-31, 128 kb/s, 1000k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> libx264)
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height




Here's the ffserver configuration:

Port 8090
RTSPPort 7654
BindAddress 0.0.0.0
RTSPBindAddress 0.0.0.0
MaxHTTPConnections 2000
MaxClients 1000
MaxBandwidth 1000
CustomLog -


<Feed feed1.ffm>
File /data/feed1.ffm
ACL allow 127.0.0.1
</Feed>


<Stream test1.flv>
   Feed feed1.ffm
   Format flv
   VideoCodec libx264
   AVOptionVideo flags +global_header
   VideoSize 800X640
   NoAudio
</Stream>


##################################################################
# Special streams

# Server status

<Stream stat.html>
Format status

# Only allow local people to get the status
ACL allow localhost
ACL allow 192.168.0.0 192.168.255.255

#FaviconURL http://pond1.gladstonefamily.net:8080/favicon.ico
</Stream>