erlendr@pc4038:~$ ffmpeg -f alsa -ac 2 -i pulse -f x11grab -s 1680x1050 -r 25 -i :0.0+0,0 -vcodec libtheora -pix_fmt yuv420p -vf yadif,scale=1280:720 -r 20 -acodec libvorbis -ab 160000 -g 30 -threads 0 -f ogg - | vlc -I dummy - --sout '#std{access=http,mux=ogg,dst=:8080}'
VLC media player 1.0.6 Goldeneye
ffmpeg version git-2012-05-23-0da28d6 Copyright (c) 2000-2012 the FFmpeg developers
  built on May 23 2012 16:04:42 with gcc 4.4.3
  configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3 --enable-x11grab
  libavutil      51. 53.100 / 51. 53.100
  libavcodec     54. 23.100 / 54. 23.100
  libavformat    54.  6.100 / 54.  6.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 76.100 /  2. 76.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[alsa @ 0x94ae440] Estimating duration from bitrate, this may be inaccurate
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, alsa, from 'pulse':
  Duration: N/A, start: 1338304658.096746, bitrate: 1536 kb/s
    Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[x11grab @ 0x94a8940] device: :0.0+0,0 -> display: :0.0 x: 0 y: 0 width: 1680 height: 1050
[x11grab @ 0x94a8940] shared memory extension found
[0x847ca70] dummy interface: using the dummy interface module...
[x11grab @ 0x94a8940] Estimating duration from bitrate, this may be inaccurate
Input #1, x11grab, from ':0.0+0,0':
  Duration: N/A, start: 1338304660.105669, bitrate: 1411200 kb/s
    Stream #1:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1680x1050, 1411200 kb/s, 25 tbr, 1000k tbn, 25 tbc
[buffer @ 0x94d0480] w:1680 h:1050 pixfmt:bgr0 tb:1/1000000 sar:0/1 sws_param:flags=2
[buffersink @ 0x94d0340] No opaque field provided
[yadif @ 0x94a6020] mode:0 parity:-1 auto_enable:0
[yadif @ 0x94a6020] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'Parsed_yadif_0'
[0x848ac78] main access out: creating httpd
[0x848c1a8] mux_ogg mux: Open
[scale @ 0x94a86c0] w:1680 h:1050 fmt:bgr0 sar:0/1 -> w:1680 h:1050 fmt:yuv444p10le sar:0/1 flags:0x4
[scale @ 0x94a8740] w:1680 h:1050 fmt:yuv444p10le sar:0/1 -> w:1280 h:720 fmt:yuv420p sar:0/1 flags:0x4
[aformat @ 0x9515b20] auto-inserting filter 'auto-inserted resampler 0' between the filter 'src' and the filter 'aformat'
[aresample @ 0x9596a80] r:48000Hz -> r:48000Hz
Output #0, ogg, to 'pipe:':
  Metadata:
    encoder         : Lavf54.6.100
    Stream #0:0: Video: theora, yuv420p, 1280x720, q=2-31, 200 kb/s, 20 tbn, 20 tbc
    Stream #0:1: Audio: vorbis, 48000 Hz, stereo, flt, 160 kb/s
Stream mapping:
  Stream #1:0 -> #0:0 (rawvideo -> libtheora)
  Stream #0:0 -> #0:1 (pcm_s16le -> libvorbis)
Press [q] to stop, [?] for help
[libvorbis @ 0x94a7440] Que input is backward in time
[0x84859e8] main input error: ES_OUT_RESET_PCR called05.02 bitrate=   5.4kbits/s dup=88 drop=0
[0x848c1a8] main mux error: cannot add this stream
[0x84ad5e8] main packetizer error: cannot create packetizer output (I420)
[0x84859e8] main input error: ES_OUT_SET_(GROUP_)PCR  is called too late, increasing pts_delay to 1251 ms
[0x84859e8] main input error: ES_OUT_RESET_PCR called
[0x84859e8] main input error: ES_OUT_SET_(GROUP_)PCR  is called too late, increasing pts_delay to 3543 ms
[0x84859e8] main input error: ES_OUT_RESET_PCR called
frame=  370 fps= 13 q=0.0 Lsize=     493kB time=00:00:17.57 bitrate= 229.7kbits/s dup=342 drop=0
video:481kB audio:1kB global headers:7kB muxing overhead 0.802358%
[0x848c1a8] mux_ogg mux: Close
^C[0x83d34a0] signals interface error: Caught Interrupt signal, exiting...