[wmain@vmi55044 ~]$ /usr/local/bin/ffmpeg '-y' '-i' '1.mp4' '-async' '1' '-metad                                                                                                                                                              ata:s:v:0' 'start_time=0' '-s' '320x240' '-vcodec' 'libx264' '-acodec' 'libfaac'                                                                                                                                                               '-b:v' '1000k' '-refs' '6' '-coder' '1' '-sc_threshold' '40' '-flags' '+loop' '                                                                                                                                                              -me_range' '16' '-subq' '7' '-i_qfactor' '0.71' '-qcomp' '0.6' '-qdiff' '4' '-tr                                                                                                                                                              ellis' '1' '-b:a' '128k' '-pass' '1' '-passlogfile' '/tmp/ffmpeg-passes568565f8a                                                                                                                                                              36fcplbz2/pass-568565f8a38d8' '/home/wmain/4444.mp4'
ffmpeg version 2.8.4 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)
  configuration:
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2015-12-22 01:27:31
  Duration: 00:00:45.89, start: 0.000000, bitrate: 5034 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709)                                                                                                                                                              , 1920x1080, 4716 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2015-12-22 01:27:31
      handler_name    : Alias Data Handler
      encoder         : AVC Coding
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, flt                                                                                                                                                              p, 317 kb/s (default)
    Metadata:
      creation_time   : 2015-12-22 01:27:31
      handler_name    : Alias Data Handler
Unknown encoder 'libx264'