C:\ffmpeg\ffmpeg.exe -r 60 -i frames\frame-%d.png -r 60 -y video.avi

ffmpeg version N-58699-ge3d7a39 Copyright (c) 2000-2013 the FFmpeg developers
  built on Dec  1 2013 22:07:24 with gcc 4.8.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 56.100 / 52. 56.100
  libavcodec     55. 44.100 / 55. 44.100
  libavformat    55. 22.100 / 55. 22.100
  libavdevice    55.  5.102 / 55.  5.102
  libavfilter     3. 91.100 /  3. 91.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, image2, from 'frames\frame-%d.png':
  Duration: 00:00:24.00, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, pal8, 640x480, 25 fps, 25 tbr, 25 tbn, 25 tbc
Output #0, avi, to 'video.avi':
  Metadata:
    ISFT            : Lavf55.22.100
    Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 640x480, q=2-31, 200 kb/s, 60 tbn, 60 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (png -> mpeg4)
Press [q] to stop, [?] for help
Input stream #0:0 frame changed from size:640x480 fmt:pal8 to size:640x480 fmt:rgb24
Input stream #0:0 frame changed from size:640x480 fmt:rgb24 to size:640x480 fmt:pal8
Input stream #0:0 frame changed from size:640x480 fmt:pal8 to size:640x480 fmt:rgb24
Input stream #0:0 frame changed from size:640x480 fmt:rgb24 to size:640x480 fmt:pal8
Input stream #0:0 frame changed from size:640x480 fmt:pal8 to size:640x480 fmt:rgb24
Input stream #0:0 frame changed from size:640x480 fmt:rgb24 to size:640x480 fmt:pal8
Input stream #0:0 frame changed from size:640x480 fmt:pal8 to size:640x480 fmt:rgb24
frame=   70 fps=0.0 q=13.0 size=     122kB time=00:00:01.16 bitrate= 854.0kbits/s dup=0 drop=98
frame=  145 fps=145 q=24.8 size=     257kB time=00:00:02.41 bitrate= 870.6kbits/s dup=0 drop=157
frame=  259 fps=172 q=31.0 size=     479kB time=00:00:04.31 bitrate= 908.4kbits/s dup=0 drop=157
Input stream #0:0 frame changed from size:640x480 fmt:rgb24 to size:640x480 fmt:pal8
Input stream #0:0 frame changed from size:640x480 fmt:pal8 to size:640x480 fmt:rgb24
frame=  265 fps=132 q=31.0 size=     494kB time=00:00:04.41 bitrate= 915.5kbits/s dup=0 drop=325
frame=  265 fps=130 q=31.0 Lsize=     498kB time=00:00:04.41 bitrate= 923.2kbits/s dup=0 drop=335

video:486kB audio:0kB subtitle:0 global headers:0kB muxing overhead 2.445231%