Uploading video with carrierwave-video an error : "Video Failed to transcode with FFmpeg."

I have already added new column to microposts as video. And now I want to use carrierwave-video gem (http://ift.tt/1O1XMWn). Now when I tried to upload video I have an error. (I have tried to upload video in .MOV format)

Error

Video Failed to transcode with FFmpeg. Check ffmpeg install and verify video is not corrupt or cut short. Original error: undefined method `set_success' for #<Micropost:0x007fbf0d40dd68>

video_uploader.rb

class VideoUploader < CarrierWave::Uploader::Base
  include CarrierWave::Video

  process encode_video: [:mp4, callbacks: { after_transcode: :set_success } ]
  storage :file

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end
end

Gemfile

 gem 'carrierwave',             '0.10.0'
 gem 'carrierwave-video'

micropost Model

 mount_uploader :video, VideoUploader

I have also made configurations in my FFmpeg file with a file download from FFmpeg.

 Taner-MacBook-Pro:~ tanerkoroglu$  /Users/tanerkoroglu/Downloads/SnowLeopard_Lion_Mountain_Lion_Mavericks_12.12.2015/ffmpeg ; exit;
 ffmpeg version 2.8.2 Copyright (c) 2000-2015 the FFmpeg developers
  built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --enable-libvidstab --enable-libx265 --disable-doc --arch=x86_64 --enable-runtime-cpudetect
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
 Hyper fast Audio and Video encoder
   usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

  Use -h to get full help or, even better, run 'man ffmpeg'
   logout
   Saving session...
    ...copying shared history...
     ...saving history...truncating history files...
      ...completed.
    Deleting expired sessions...146 completed.