[FFmpeg-user] blackframe and blackdetect

[LsBender]

I had a look at:
http://ffmpeg.org/ffmpeg.html#blackframe
http://ffmpeg.org/ffmpeg.html#blackframe 
That's why I tried something like that:
/ffmpeg blackframe=98:32 test.avi/


But I have this error:
/
lefebvre at lefebvre-laptop:~/Bureau$ ffmpeg blackframe=98:32 test.avi
FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1.3, Copyright (c) 2000-2009
Fabrice Bellard, et al.
  configuration: --extra-version=4:0.5.1-1ubuntu1.3 --prefix=/usr
--enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib
--enable-libgsm --enable-libschroedinger --enable-libspeex
--enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib
--disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl
--enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394
--enable-shared --disable-static
  libavutil     49.15. 0 / 49.15. 0
  libavcodec    52.20. 1 / 52.20. 1
  libavformat   52.31. 0 / 52.31. 0
  libavdevice   52. 1. 0 / 52. 1. 0
  libavfilter    0. 4. 0 /  0. 4. 0
  libswscale     0. 7. 1 /  0. 7. 1
  libpostproc   51. 2. 0 / 51. 2. 0
  built on Dec 21 2011 18:37:21, gcc: 4.4.3
Unable to find a suitable output format for 'blackframe=98:32'/

I didn't understand this line of the ffmpeg documentation :
"In order to display the output lines, you need to set the loglevel at least
to the AV_LOG_INFO value"

Thanks for your time

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