Ruby on Rails

this here is how i do it

def create_thumbnail
     jpg = File.join(File.dirname(vidfile.path), "#{id}.jpg")
    File.open(jpg, 'w')
     command = <<-end_command
      ffmpeg -itsoffset -4 -i #{ vidfile.path } -y -vcodec mjpeg -vframes 1 -an -f rawvideo -s 160x120  #{ jpg }
    end_command
    command.gsub!(/\s+/, " ")
  end

you have to manually delete the file on destroy since paperclip is only aware of the file i uploaded which it the video file and will not delete the jpg file.

File.delete(@vidfile.path.gsub(/flv/,"jpg"))

also you have to delete the original, and update the db entry

 def set_new_filename
    File.delete(vidfile.path)
    update_attribute(:vidfile_file_name, "#{id}.flv")
    update_attribute(:vidfile_thumb, "#{id}.jpg")
  end

 i also set everything in an starling worker

ConvertWorker.async_convert_video(:file_path => vidfile.path)

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