Zhenyas-MacBook-Pro:ffmpeg lewisou$ ./ffmpeg -i b2.mp4
ffmpeg version N-65526-g52b81ff Copyright (c) 2000-2014 the FFmpeg developers
  built on Aug 13 2014 14:13:48 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
  configuration: --enable-libx264 --enable-libass --enable-gpl --disable-yasm
  libavutil      54.  1.100 / 54.  1.100
  libavcodec     56.  0.100 / 56.  0.100
  libavformat    56.  0.100 / 56.  0.100
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  0.100 /  5.  0.100
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  0.100 /  1.  0.100
  libpostproc    53.  0.100 / 53.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'b2.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 0
    compatible_brands: isom3gp4
    creation_time   : 2014-08-13 05:10:25
  Duration: 00:01:03.45, start: 0.000000, bitrate: 976 kb/s
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x480, 851 kb/s, 8.29 fps, 16.58 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2014-08-13 05:10:25
      handler_name    : VideoHandle
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 124 kb/s (default)
    Metadata:
      creation_time   : 2014-08-13 05:10:25
      handler_name    : SoundHandle
At least one output file must be specified