[FFmpeg-user] crop detect not working

[Elliott Balsley]

I’m trying to use the cropdetect filter on some JPEG images, but it’s not showing anything useful in the console output.  I checked to see if it’s available with “ffplay -filters” and that shows the following line:
 T.. cropdetect       V->V       Auto-detect crop size.

Example command:
$ ffplay -i A002C001_140919_R6OW.000072.jpg -vf "cropdetect=24:16:0"
ffplay version 2.3.git-9b8eedd Copyright (c) 2003-2014 the FFmpeg developers
  built on Sep 19 2014 00:12:16 with Apple LLVM version 6.0 (clang-600.0.51) (based on LLVM 3.5svn)
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-vda --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid --enable-nonfree --enable-libfdk-aac --enable-libfaac
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  3.100 / 56.  3.100
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  0.103 /  5.  0.103
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
Input #0, image2, from 'A002C001_140919_R6OW.000072.jpg':0B f=0/0   
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg), 512x288 [SAR 144:144 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
[swscaler @ 0x7fdd3480c600] deprecated pixel format used, make sure you did set range correctly
   1.98 M-V:  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0