ruby-on-rails – 如何使用paperclip-Rails加载和验证视频

使用回形针我组织了上传图片.有用.

现在我想组织一个视频上传.我改变了这个模型：
模型：

class Video < ActiveRecord::Base
  validates :title,presence: true
  validates :video,presence: true

  belongs_to :user

  has_attached_file   :video,:styles => { :medium => "300x300>",:thumb => "100x100>" },:default_url => "/images/:style/missing.png"

  validates_attachment_content_type :video,:content_type => /Avideo/.*Z/  
  validates_attachment_file_name :video,:matches => [/3gpZ/,/mp4Z/,/flvZ/]  

 validate :file_size_validation,:if => "video?"  

  def file_size_validation
    errors[:video] << "should be less than 2MB" if video.size.to_i > 30.megabytes
  end  
end

视频控制器：

def create
  @video = Video.new(video_params)   

  if @video.save
    @video.update_attributes(user: current_user)

    flash[:success] = :video_created
    redirect_to @video
  else
    flash.now[:error] = :user_not_created
    render 'new'
  end
end

形成：

<%= form_for(@video) do |f| %>
    <%= f.text_field  :title %>
    <%= f.file_field  :video %>
    <%= f.submit %>
<% end %>

尝试上传视频后,我得到控制台以下错误消息：

Started POST "/videos" for 127.0.0.1 at 2015-07-23 14:17:32 +0300
Processing by VideosController#create as HTML
  Parameters: {"utf8"=>"?","authenticity_token"=>"RF3w8PzZ9LZ4pdqRPqRvHMQ+nYDL4om0YHAMlzTm8tf3iFmVmKxXSYKap3C0ogEnOkifm9i01oXs/rTX9zmtPA==","video"=>{"title"=>"tty","video"=>#<ActionDispatch::Http::UploadedFile:0x007f6624f10770 @tempfile=#<Tempfile:/tmp/RackMultipart20150723-13428-u7s8i8.flv>,@original_filename="mmm.flv",@content_type="video/x-flv",@headers="Content-Disposition: form-data; name="video"; filename="mmm.flv"rnContent-Type: video/x-flvrn">},"commit"=>"Create Video"}
  User Load (0.3ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1  ORDER BY "users"."id" ASC LIMIT 1  [["id",8]]
Command :: file -b --mime '/tmp/c4efd5020cb49b9d3257ffa0fbccc0ae20150723-13428-6gn39i.flv'
Command :: identify -format '%wx%h,%[exif:orientation]' '/tmp/c4efd5020cb49b9d3257ffa0fbccc0ae20150723-13428-1eailfd.flv[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
Command :: identify -format '%wx%h,%[exif:orientation]' '/tmp/c4efd5020cb49b9d3257ffa0fbccc0ae20150723-13428-1eailfd.flv[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
   (0.2ms)  BEGIN
Command :: file -b --mime '/tmp/c4efd5020cb49b9d3257ffa0fbccc0ae20150723-13428-khstwa.flv'
   (0.2ms)  ROLLBACK

在屏幕上显示以下错误消息：

Video Paperclip::Errors::NotIdentifiedByImageMagickError

其中imageMagik安装在我的系统中：

sudo apt-get install imagemagick

D b：

create_table "videos",force: :cascade do |t|
    t.datetime "created_at",null: false
    t.datetime "updated_at",null: false
    t.string   "title"
    t.integer  "user_id"
    t.string   "video_file_size"
    t.string   "video_updated_at"
    t.string   "video_file_name"
    t.string   "video_content_type"
  end