bash-3.2# ffmpeg -i rtsp://192.168.0.100:554 -sameq -vframes 1 frame%d.jpg
ffmpeg version N-40517-ga548671 Copyright (c) 2000-2012 the FFmpeg developers
  built on May 10 2012 00:46:52 with llvm_gcc 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)
  configuration: --enable-libmp3lame --enable-libfaac --enable-gpl --enable-nonfree --enable-shared --disable-mmx --arch=x86_64 --cpu=core2 --enable-libvorbis --enable-libtheora
  libavutil      51. 50.100 / 51. 50.100
  libavcodec     54. 21.100 / 54. 21.100
  libavformat    54.  4.100 / 54.  4.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 72.105 /  2. 72.105
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 11.100 /  0. 11.100
  libpostproc    52.  0.100 / 52.  0.100
[h264 @ 0x7fc074053a00] Missing reference picture
[h264 @ 0x7fc074053a00] decode_slice_header error
[h264 @ 0x7fc074053a00] Missing reference picture
[h264 @ 0x7fc074053a00] decode_slice_header error
[h264 @ 0x7fc074053a00] concealing 5120 DC, 5120 AC, 5120 MV errors
[rtsp @ 0x7fc07403ea00] Estimating duration from bitrate, this may be inaccurate
Input #0, rtsp, from 'rtsp://192.168.0.100:554':
  Metadata:
    title           : VStream Live
    comment         : ICL Streaming Media
  Duration: N/A, start: 0.072000, bitrate: 32 kb/s
    Stream #0:0: Video: h264 (Baseline), yuv420p, 1280x1024, 14.92 tbr, 90k tbn, 180k tbc
    Stream #0:1: Audio: mp2, 16000 Hz, mono, s16, 32 kb/s
[buffer @ 0x7fc073c19b20] w:1280 h:1024 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:flags=2
[buffersink @ 0x7fc073c1cb00] auto-inserting filter 'auto-inserted scale 0' between the filter 'src' and the filter 'out'
[scale @ 0x7fc073c1ce00] w:1280 h:1024 fmt:yuv420p sar:0/1 -> w:1280 h:1024 fmt:yuvj420p sar:0/1 flags:0x4
Output #0, image2, to 'frame%d.jpg':
  Metadata:
    title           : VStream Live
    comment         : ICL Streaming Media
    encoder         : Lavf54.4.100
    Stream #0:0: Video: mjpeg, yuvj420p, 1280x1024, q=2-31, 200 kb/s, 90k tbn, 14.92 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> mjpeg)
Press [q] to stop, [?] for help
[h264 @ 0x7fc07411b000] Missing reference picture
[h264 @ 0x7fc07411b000] decode_slice_header error
[h264 @ 0x7fc07411b000] Missing reference picture
[h264 @ 0x7fc07411b000] decode_slice_header error
[h264 @ 0x7fc07411b000] concealing 5120 DC, 5120 AC, 5120 MV errors
frame=    1 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.06 bitrate=   0.0kbits/s
video:105kB audio:0kB global headers:0kB muxing overhead -100.000000%