Spawning ffmpeg with command: /home/ec2-user/bin/ffmpeg -i mp4/intro_1136.mp4 -i 1244f872-9f64-11e3-862c-22000a8d961c -i mp4/post_1136.mp4 -filter_complex '[0:0] [0:1] [1:0] [1:1] [2:1] [2:0] concat=n=3:v=1:a=1 [v] [a]' -map '[v]' -map '[a]' -c:v libx264 -c:a libfdk_aac -y derek_out.mp4
ffmpeg version git-2014-02-26-1524b0f Copyright (c) 2000-2014 the FFmpeg developers
  built on Feb 26 2014 22:32:00 with gcc 4.6.3 (GCC) 20120306 (Red Hat 4.6.3-2)
  configuration: --prefix=/home/ec2-user/ffmpeg_build --extra-cflags=-I/home/ec2-user/ffmpeg_build/include --extra-ldflags=-L/home/ec2-user/ffmpeg_build/lib --bindir=/home/ec2-user/bin --extra-libs=-ldl --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
  libavutil      52. 66.100 / 52. 66.100
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.100 / 55. 33.100
  libavdevice    55. 10.100 / 55. 10.100
  libavfilter     4.  2.100 /  4.  2.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mp4/intro_1136.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf55.33.100
  Duration: 00:00:02.04, start: 0.046440, bitrate: 2221 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 640x1136, 2128 kb/s, 24 fps, 24 tbr, 19200 tbn, 38400 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '1244f872-9f64-11e3-862c-22000a8d961c':
  Metadata:
    major_brand     : mp42
    minor_version   : 1
    compatible_brands: mp41mp42isom
    creation_time   : 2014-02-27 00:38:53
  Duration: 00:00:15.41, start: 0.000000, bitrate: 1382 kb/s
    Stream #1:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x1136, 1308 kb/s, 30.10 fps, 60 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      creation_time   : 2014-02-27 00:38:53
      handler_name    : Core Media Video
    Stream #1:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 64 kb/s (default)
    Metadata:
      creation_time   : 2014-02-27 00:38:53
      handler_name    : Core Media Audio
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'mp4/post_1136.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 1
    compatible_brands: mp42avc1
    creation_time   : 2014-02-27 02:00:14
  Duration: 00:00:13.29, start: 0.000000, bitrate: 2553 kb/s
    Stream #2:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2014-02-27 02:00:14
      handler_name    : Apple Sound Media Handler
    Stream #2:1(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 640x1136, 2418 kb/s, 24 fps, 24 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      creation_time   : 2014-02-27 02:00:14
      handler_name    : Apple Video Media Handler
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x2b4eb20] Invalid stream specifier: '[v]'.
    Last message repeated 3 times
Stream map ''[v]'' matches no streams.

Stream map ''[v]'' matches no streams.