C:\Users\Dennis\Documents\eclipse\YTDL01\ffmpeg>bin\ffmpeg.exe -i part1.mp4 -i p
art2.mp4 -i part3.mp4 -filter_complex "[0:v]scale=1280:720[v1]; [1:v]scale=1280:
720[v2]; [2:v]scale=1280:720[v3]; [v1][0:a][v2][1:a][v3][2:a]concat=n=3:v=1:a=1[
outv][outa]" -map "[outv]" -map "[outa]" -c:v libx264 -preset ultrafast -qp 0 ou
tput.mkv
ffmpeg version N-63500-gbbc10a1 Copyright (c) 2000-2014 the FFmpeg developers
  built on May 27 2014 22:01:48 with gcc 4.8.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-
libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libope
njpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsox
r --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab -
-enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-
libxavs --enable-libxvid --enable-decklink --enable-zlib
  libavutil      52. 87.100 / 52. 87.100
  libavcodec     55. 65.100 / 55. 65.100
  libavformat    55. 41.100 / 55. 41.100
  libavdevice    55. 13.101 / 55. 13.101
  libavfilter     4.  5.100 /  4.  5.100
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 19.100 /  0. 19.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'part1.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 1
    compatible_brands: isomavc1mp423gp5
    creation_time   : 2009-03-07 10:13:48
  Duration: 00:00:26.96, start: 0.000000, bitrate: 859 kb/s
    Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 10
8 kb/s (default)
    Metadata:
      creation_time   : 2009-03-07 10:13:48
      handler_name    : GPAC ISO Audio Handler
    Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x480 [
SAR 1:1 DAR 4:3], 747 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2009-03-07 10:13:48
      handler_name    : GPAC ISO Video Handler
    Stream #0:2(und): Data: none (mp4s / 0x7334706D), 0 kb/s (default)
    Metadata:
      creation_time   : 2009-03-07 10:13:48
      handler_name    : GPAC MPEG-4 OD Handler
    Stream #0:3(und): Data: none (mp4s / 0x7334706D), 0 kb/s (default)
    Metadata:
      creation_time   : 2009-03-07 10:13:48
      handler_name    : GPAC MPEG-4 Scene Description Handler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'part2.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2014-01-06 09:38:34
  Duration: 00:05:22.50, start: 0.000000, bitrate: 1677 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720,
 1483 kb/s, 23.98 fps, 23.98 tbr, 48k tbn, 47.95 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #1:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 19
1 kb/s (default)
    Metadata:
      creation_time   : 2014-01-06 09:38:35
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'part3.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2014-03-07 19:42:40
  Duration: 00:06:35.34, start: 0.000000, bitrate: 592 kb/s
    Stream #2:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yu
v420p, 480x352 [SAR 1:1 DAR 15:11], 494 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.
94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #2:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96
 kb/s (default)
    Metadata:
      creation_time   : 2014-03-07 19:42:42
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
File 'output.mkv' already exists. Overwrite ? [y/N] y
[Parsed_concat_3 @ 0413a9e0] Input link in1:v0 parameters (size 1280x720, SAR 0:
1) do not match the corresponding output link in0:v0 parameters (1280x720, SAR 3
:4)
[Parsed_concat_3 @ 0413a9e0] Failed to configure output pad on Parsed_concat_3

C:\Users\Dennis\Documents\eclipse\YTDL01\ffmpeg>