ffmpeg -i /home/fp/videos/Milf9S1.flv -vcodec mjpeg -vframes 1 -an -f rawvideo -s 180x135 -ss 00:09:22 /home/fp/thumbnails/Milf9S1.flv/1.jpg
ffmpeg version N-35282-g4b4a02b, Copyright (c) 2000-2011 the FFmpeg developers
  built on Nov 29 2011 18:29:23 with gcc 4.4.5
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
  libavutil    51. 29. 1 / 51. 29. 1
  libavcodec   53. 39. 1 / 53. 39. 1
  libavformat  53. 22. 0 / 53. 22. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 50. 0 /  2. 50. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0

Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 29.97 (30000/1001)
Input #0, flv, from '/home/fp/videos/Milf9S1.flv':
  Metadata:
    canSeekToEnd    : true
    creationdate    : Wed Jul 22 17:35:49 2009
    lasttimestamp   : 1578
    lastkeyframetimestamp: 1578
    audiodelay      : 0
    metadatacreator : Manitu Group FLV MetaData Injector 2
    videosize       : 215806724
    audiosize       : 26151468
    datasize        : 3461
  Duration: 00:26:17.69, start: 0.000000, bitrate: 1226 kb/s
    Stream #0:0: Video: vp6f, yuv420p, 638x480, 1024 kb/s, 29.97 tbr, 1k tbn, 1k tbc
    Stream #0:1: Audio: mp3, 44100 Hz, stereo, s16, 128 kb/s
Incompatible pixel format 'yuv420p' for codec 'mjpeg', auto-selecting format 'yuvj420p'
[buffer @ 0x14be200] w:638 h:480 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
[scale @ 0x14a4240] w:638 h:480 fmt:yuv420p -> w:180 h:135 fmt:yuvj420p flags:0x4
Output #0, rawvideo, to '/home/fp/thumbnails/Milf9S1.flv/1.jpg':
  Metadata:
    canSeekToEnd    : true
    creationdate    : Wed Jul 22 17:35:49 2009
    lasttimestamp   : 1578
    lastkeyframetimestamp: 1578
    audiodelay      : 0
    metadatacreator : Manitu Group FLV MetaData Injector 2
    videosize       : 215806724
    audiosize       : 26151468
    datasize        : 3461
    encoder         : Lavf53.22.0
    Stream #0:0: Video: mjpeg, yuvj420p, 180x135, q=2-31, 200 kb/s, 90k tbn, 29.97 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (vp6f -> mjpeg)
Press [q] to stop, [?] for help
frame=    0 fps=  0 q=0.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s