Create a new version of paste:

HTTPPort 8090
HTTPBindAddress 0.0.0.0
MaxHTTPConnections 200
MaxClients 100
MaxBandwidth 10000

<Feed live.ffm>
File /tmp/feed1.ffm
FileMaxSize 1G
ACL allow 127.0.0.1
</Feed>

<Stream live.mp4>
Feed live.ffm
Format mp4
 
VideoCodec libx264
VideoFrameRate 60
VideoBitRate 800
VideoSize 1920x1088
AVOptionVideo crf 23
AVOptionVideo preset medium
AVOptionVideo me_range 16
AVOptionVideo qdiff 4
AVOptionVideo qmin 10
AVOptionVideo qmax 51
AVOptionVideo flags +global_header
 
AudioCodec aac
Strict -2
AudioBitRate 128
AudioChannels 2
AudioSampleRate 44100
AVOptionAudio flags +global_header
</Stream>

---------------------------------------------------------------------------------------------

ffmpeg -f x11grab -s 1920x1080 -i :0.0 -f alsa -i default -strict -2 -movflags +faststart http://localhost:8090/live.ffm

ffmpeg version 2.4.3-1ubuntu1~trusty6 Copyright (c) 2000-2014 the FFmpeg developers
  built on Nov 22 2014 17:07:19 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --prefix=/usr --extra-version='1ubuntu1~trusty6' --build-suffix=-ffmpeg --toolchain=hardened --extra-cflags= --extra-cxxflags= --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-fontconfig --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-opengl --enable-x11grab --enable-libxvid --enable-libx265 --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libx264 --enable-libsoxr --enable-openal --enable-libopencv
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  4.101 / 56.  4.101
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  1.100 /  5.  1.100
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
[x11grab @ 0xbb9fc0] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 1920 height: 1080
[x11grab @ 0xbb9fc0] shared memory extension found
Input #0, x11grab, from ':0.0':
  Duration: N/A, start: 1506674555.894267, bitrate: 1988667 kb/s
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, 1988667 kb/s, 29.97 tbr, 1000k tbn, 29.97 tbc
Guessed Channel Layout for  Input Stream #1.0 : stereo
Input #1, alsa, from 'default':
  Duration: N/A, start: 1506674555.929576, bitrate: 1536 kb/s
    Stream #1:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
[libx264 @ 0xc0cd40] VBV is incompatible with constant QP, ignored.
[libx264 @ 0xc0cd40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
[libx264 @ 0xc0cd40] profile High 4:4:4 Predictive, level 4.0, 4:4:4 8-bit
[libx264 @ 0xc0cd40] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0x1:0x111 me=dia subme=8 psy=0 mixed_ref=0 me_range=16 chroma_me=0 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=12 keyint_min=7 scenecut=0 intra_refresh=0 rc=cqp mbtree=0 qp=0
Output #0, ffm, to 'http://localhost:8090/live.ffm':
  Metadata:
    creation_time   : now
    encoder         : Lavf56.4.101
    Stream #0:0: Audio: aac, 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc56.1.100 aac
    Stream #0:1: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 1920x1088, q=10-51, 800 kb/s, 29.97 fps, 1000k tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc56.1.100 libx264
Stream mapping:
  Stream #1:0 -> #0:0 (pcm_s16le (native) -> aac (native))
  Stream #0:0 -> #0:1 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
frame=   18 fps=0.0 q=0.0 size=    1660kB time=00:00:00.41 bitrate=32553.7kbits/
frame=   33 fps= 33 q=0.0 size=    4104kB time=00:00:00.95 bitrate=35300.1kbits/
frame=   48 fps= 32 q=0.0 size=    5408kB time=00:00:01.46 bitrate=30260.9kbits/
frame=   63 fps= 31 q=0.0 size=    6716kB time=00:00:01.97 bitrate=27855.2kbits/
...

---------------------------------------------------------------------------------------------

ffplay http://localhost:8090/live.mp4

ffplay version 2.4.3-1ubuntu1~trusty6 Copyright (c) 2003-2014 the FFmpeg developers
  built on Nov 22 2014 17:07:19 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --prefix=/usr --extra-version='1ubuntu1~trusty6' --build-suffix=-ffmpeg --toolchain=hardened --extra-cflags= --extra-cxxflags= --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-fontconfig --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-opengl --enable-x11grab --enable-libxvid --enable-libx265 --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libx264 --enable-libsoxr --enable-openal --enable-libopencv
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  4.101 / 56.  4.101
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  1.100 /  5.  1.100
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd5f00008c0] Format mov,mp4,m4a,3gp,3g2,mj2 detected only with low score of 1, misdetection possible!
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd5f00008c0] moov atom not found
http://localhost:8090/live.mp4: Invalid data found when processing input