title: Extract Video Frames In Python
body: <p>I want to extract video frames and save them as image.</p>
  
  <pre><code>import os, sys
  from PIL import Image
  
  a, b, c = os.popen3("ffmpeg -i test.avi")
  out = c.read()
  dp = out.index("Duration: ")
  duration = out[dp+10:dp+out[dp:].index(",")]
  hh, mm, ss = map(float, duration.split(":"))
  total = (hh*60 + mm)*60 + ss
  for i in xrange(9):
      t = (i + 1) * total / 10
      os.system("ffmpeg -i test.avi -ss %0.3fs frame%i.png" % (t, i))
  </code></pre>
  
  <p>But I have this error:</p>
  
  <pre><code>FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
  Mac OSX universal build for ffmpegX
    configuration:  --enable-memalign-hack --enable-mp3lame --enable-gpl --disable-vhook --disable-ffplay --disable-ffserver --enable-a52 --enable-xvid --enable-faac --enable-faad --enable-amr_nb --enable-amr_wb --enable-pthreads --enable-x264 
    libavutil version: 49.0.0
    libavcodec version: 51.9.0
    libavformat version: 50.4.0
    built on Apr 15 2006 04:58:19, gcc: 4.0.1 (Apple Computer, Inc. build 5250)
  Input #0, avi, from 'test.avi':
    Duration: 00:00:30.5, start: 0.000000, bitrate: 465 kb/s
    Stream #0.0, 25.00 fps(r): Video: mpeg4, yuv420p, 640x480
    Stream #0.1: Audio: mp3, 32000 Hz, mono, 32 kb/s
  Unable for find a suitable output format for 'frame0.png'
  </code></pre>
  
  <p>Edit: ffmpeg -formats</p>
  
  <pre><code>FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
  Mac OSX universal build for ffmpegX
    configuration:  --enable-memalign-hack --enable-mp3lame --enable-gpl --disable-vhook --disable-ffplay --disable-ffserver --enable-a52 --enable-xvid --enable-faac --enable-faad --enable-amr_nb --enable-amr_wb --enable-pthreads --enable-x264 
    libavutil version: 49.0.0
    libavcodec version: 51.9.0
    libavformat version: 50.4.0
    built on Apr 15 2006 04:58:19, gcc: 4.0.1 (Apple Computer, Inc. build 5250)
  File formats:
    E 3g2             3gp2 format
    E 3gp             3gp format
   D  4xm             4X Technologies format
   D  RoQ             Id RoQ format
   D  aac             ADTS AAC
   DE ac3             raw ac3
    E adts            ADTS AAC
   DE aiff            Audio IFF
   DE alaw            pcm A law format
   DE amr             3gpp amr file format
   DE asf             asf format
    E asf_stream      asf format
   DE au              SUN AU Format
   DE avi             avi format
   D  avs             avs format
    E crc             crc testing format
   D  daud            D-Cinema audio format
   D  dts             raw dts
   DE dv              DV video format
    E dvd             MPEG2 PS format (DVD VOB)
   D  ea              Electronic Arts Multimedia Format
   DE ffm             ffm format
   D  film_cpk        Sega FILM/CPK format
   D  flic            FLI/FLC/FLX animation format
   DE flv             flv format
    E framecrc        framecrc testing format
   DE gif             GIF Animation
   DE h261            raw h261
   DE h263            raw h263
   DE h264            raw H264 video format
   D  idcin           Id CIN format
   DE image           image sequence
   DE image2          image2 sequence
   DE image2pipe      piped image2 sequence
   DE imagepipe       piped image sequence
   D  ingenient       Ingenient MJPEG
   D  ipmovie         Interplay MVE format
   DE m4v             raw MPEG4 video format
   D  matroska        Matroska file format
   DE mjpeg           MJPEG video
   D  mm              American Laser Games MM format
   DE mmf             mmf format
    E mov             mov format
   D  mov,mp4,m4a,3gp,3g2,mj2 QuickTime/MPEG4/Motion JPEG 2000 format
    E mp2             MPEG audio layer 2
   DE mp3             MPEG audio layer 3
    E mp4             mp4 format
   DE mpeg            MPEG1 System format
    E mpeg1video      MPEG video
    E mpeg2video      MPEG2 video
   DE mpegts          MPEG2 transport stream format
   D  mpegvideo       MPEG video
    E mpjpeg          Mime multipart JPEG format
   DE mulaw           pcm mu law format
   D  nsv             NullSoft Video format
    E null            null video format
   DE nut             nut format
   D  nuv             NuppelVideo format
   D  ogg             Ogg
    E psp             psp mp4 format
   D  psxstr          Sony Playstation STR format
   DE rawvideo        raw video format
   D  redir           Redirector format
   DE rm              rm format
    E rtp             RTP output format
   D  rtsp            RTSP input format
   DE s16be           pcm signed 16 bit big endian format
   DE s16le           pcm signed 16 bit little endian format
   DE s8              pcm signed 8 bit format
   D  sdp             SDP
   D  shn             raw shorten
   D  smk             Smacker Video
   D  sol             Sierra SOL Format
    E svcd            MPEG2 PS format (VOB)
   DE swf             Flash format
   D  tta             true-audio
   DE u16be           pcm unsigned 16 bit big endian format
   DE u16le           pcm unsigned 16 bit little endian format
   DE u8              pcm unsigned 8 bit format
    E vcd             MPEG1 System format (VCD)
   D  vmd             Sierra VMD format
    E vob             MPEG2 PS format (VOB)
   DE voc             Creative Voice File format
   DE wav             wav format
   D  wc3movie        Wing Commander III movie format
   D  wsaud           Westwood Studios audio format
   D  wsvqa           Westwood Studios VQA format
   DE yuv4mpegpipe    YUV4MPEG pipe format
  
  Image formats (filename extensions, if any, follow):
   DE gif    gif
  
  Codecs:
   D V    4xm
   D V D  8bps
   DEA    aac
   D V D  aasc
   DEA    ac3
   DEA    adpcm_4xm
   DEA    adpcm_adx
   DEA    adpcm_ct
   DEA    adpcm_ea
   DEA    adpcm_ima_dk3
   DEA    adpcm_ima_dk4
   DEA    adpcm_ima_qt
   DEA    adpcm_ima_smjpeg
   DEA    adpcm_ima_wav
   DEA    adpcm_ima_ws
   DEA    adpcm_ms
   DEA    adpcm_sbpro_2
   DEA    adpcm_sbpro_3
   DEA    adpcm_sbpro_4
   DEA    adpcm_swf
   DEA    adpcm_xa
   DEA    adpcm_yamaha
   D A    alac
   DEA    amr_nb
   DEA    amr_wb
   DEV D  asv1
   DEV D  asv2
   D V D  avs
   D V    bmp
   D V D  camstudio
   D V D  camtasia
   D V D  cinepak
   D V D  cljr
   D A    cook
   D V D  cyuv
   DES    dvbsub
   DES    dvdsub
   DEV D  dvvideo
   DEV D  ffv1
   DEVSD  ffvhuff
   D A    flac
   D V D  flic
   DEVSD  flv
   D V D  fraps
   DEA    g726
   DEV D  h261
   DEVSDT h263
   D VSD  h263i
    EV    h263p
   DEV DT h264
   DEVSD  huffyuv
   D V D  idcinvideo
   D V D  indeo2
   D V    indeo3
   D A    interplay_dpcm
   D V D  interplayvideo
    EV    jpegls
   D V    kmvc
    EV    ljpeg
   D V D  loco
   D A    mace3
   D A    mace6
   D V D  mdec
   DEV D  mjpeg
   D V D  mjpegb
   D V D  mmvideo
   DEA    mp2
   DEA    mp3
   D A    mp3adu
   D A    mp3on4
   DEVSDT mpeg1video
   DEVSDT mpeg2video
   DEVSDT mpeg4
   D A    mpeg4aac
   D VSDT mpegvideo
   DEVSD  msmpeg4
   DEVSD  msmpeg4v1
   DEVSD  msmpeg4v2
   D V D  msrle
   D V D  msvideo1
   D V D  mszh
   D V D  nuv
   DEV    pam
   DEV    pbm
   DEA    pcm_alaw
   DEA    pcm_mulaw
   DEA    pcm_s16be
   DEA    pcm_s16le
   DEA    pcm_s24be
   DEA    pcm_s24daud
   DEA    pcm_s24le
   DEA    pcm_s32be
   DEA    pcm_s32le
   DEA    pcm_s8
   DEA    pcm_u16be
   DEA    pcm_u16le
   DEA    pcm_u24be
   DEA    pcm_u24le
   DEA    pcm_u32be
   DEA    pcm_u32le
   DEA    pcm_u8
   DEV    pgm
   DEV    pgmyuv
   DEV    png
   DEV    ppm
   D A    qdm2
   D V D  qdraw
   D V D  qpeg
   D V D  qtrle
   DEV    rawvideo
   D A    real_144
   D A    real_288
   D A    roq_dpcm
   D V D  roqvideo
   D V D  rpza
   DEV D  rv10
   DEV D  rv20
   D A    shorten
   D A    smackaud
   D V    smackvid
   D V D  smc
   DEV    snow
   D A    sol_dpcm
   DEA    sonic
    EA    sonicls
   D V D  sp5x
   DEV D  svq1
   D VSD  svq3
   D V    theora
   D V D  truemotion1
   D V D  truemotion2
   D A    truespeech
   D A    tta
   D V D  ultimotion
   D V    vc9
   D V D  vcr1
   D A    vmdaudio
   D V D  vmdvideo
   D A    vorbis
   D V    vp3
   D V D  vqavideo
   D A    wmav1
   D A    wmav2
   DEVSD  wmv1
   DEVSD  wmv2
   D V D  wnv1
   D A    ws_snd1
   D A    xan_dpcm
   D V D  xan_wc3
   D V D  xl
    EV    xvid
   DEV D  zlib
   D V    zmbv
  
  Supported file protocols:
   file: pipe: udp: rtp: tcp: http:
  Frame size, frame rate abbreviations:
   ntsc pal qntsc qpal sntsc spal film ntsc-film sqcif qcif cif 4cif
  Motion estimation methods:
   zero(fastest) full(slowest) log phods epzs(default) x1 hex umh iter
  
  Note, the names of encoders and decoders dont always match, so there are
  several cases where the above table shows encoder only or decoder only entries
  even though both encoding and decoding are supported for example, the h263
  decoder corresponds to the h263 and h263p encoders, for file formats its even
  worse
  </code></pre>
  
  <p>What is wrong in my code? Thanks in advance</p>