ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  built on Jun 22 2013 19:12:04 with Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/1.2.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=cc --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
Input #0, image2, from 'image%d.png':
  Duration: 00:00:00.24, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, rgba, 581x581 [SAR 2835:2835 DAR 1:1], 25 fps, 25 tbr, 25 tbn, 25 tbc
Output #0, avi, to 'out.avi':
  Metadata:
    ISFT            : Lavf54.63.104
    Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 581x581 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 12 tbn, 12 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (png -> mpeg4)
Press [q] to stop, [?] for help
frame=    4 fps=0.0 q=2.0 Lsize=      44kB time=00:00:00.33 bitrate=1075.8kbits/s dup=0 drop=2
video:38kB audio:0kB subtitle:0 global headers:0kB muxing overhead 15.029896%