Question

请帮助解决问题。

使用回形针我组织了上传图片。它有效。

现在我想组织视频上传。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 => [/3gp\Z/, /mp4\Z/, /flv\Z/]  

 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

形式：

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

尝试上传视频后，我收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[video]\"; filename=\"mmm.flv\"\r\nContent-Type: video/x-flv\r\n">}, "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

屏幕上的

显示以下错误消息：

视频回形针::错误:: NotIdentifiedByImageMagickError

其中imageMagik安装在我的系统中：

sudo apt-get install imagemagick

分贝：

  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

Answer 1

与image和paperclip一起使用video是不同的。虽然常见的一点是它可以帮助您将上传的数据发送到服务器但是您需要处理它使用某些处理器。就像您对ImageMagick使用images一样，您应该FFMPEG使用encode/decode video。我将分享我通常用于视频的代码。但在此之前，您必须设置ffmpeg来处理所有格式的视频，就像您对Imagemagick所做的那样。为ffmpeg设置了 here ，并且不要忘记使用which ffmpeg

在环境文件中提供路径

您需要 ffmpeg-paperclip 以及编码/解码视频。

video.rb
##using s3 
##convert the video into mp4 and also get screenshot of video at 5 sec
##add your own formats that you want 
has_attached_file :video,
  :styles => {
      :mp4video => { :geometry => '520x390', :format => 'mp4',
        :convert_options => { :output => { :vcodec => 'libx264',
          :vpre => 'ipod640', :b => '250k', :bt => '50k',
          :acodec => 'libfaac', :ab => '56k', :ac => 2 } } },
       :preview => { :geometry => '300x300>', :format => 'jpg', :time => 5 }
    },
    processors: [:ffmpeg],
    :storage => :s3,
    :size => { :in => 0..25.megabytes },
    :s3_permissions => :public_read,
    :s3_credentials => S3_CREDENTIALS

  validates_attachment_content_type :video, :content_type => /\Avideo\/.*\Z/
  validates_presence_of :video

保存视频后，您需要使用一些插件在show操作中显示视频播放器以及视频。您可以使用 Mediaelement.js （我的。下载它，相应地将其转储到js / css文件中，将其包含在application.js和application.css中。

in your show.html.erb
##add video tag to show video

     <video autobuffer="autobuffer" preload="auto" style="width:100%;height:100%;" controls="controls" width="100%" height="100%" poster="<%= @video.video.url(:preview)%>" >
      <source  src="<%= @video.video.url%>"  />
     <%if @video.video.expiring_url(:mp4video).present? %>
     <source type="video/mp4"  src="<%= @video.video.url(:mp4video)%>" />
      <%end%>
     </video>

    ##javascript to handle video player
    $('video').mediaelementplayer();

Answer 2

<!doctype html> <html ng-app="ui.bootstrap.demo"> <head> <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.3.13/angular.js"></script> <script src="//angular-ui.github.io/bootstrap/ui-bootstrap-tpls-0.13.1.js"></script> <script src="app.js"></script> <script src="template.js"></script> <link href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div ng-controller="AccordionDemoCtrl"> <accordion close-others="oneAtATime"> <accordion-group heading="Static Header, initially expanded" is-open="status.isFirstOpen" is-disabled="status.isFirstDisabled"> This content is straight in the template. </accordion-group> </accordion> <accordion close-others="oneAtATime"> <accordion-group heading="DYnamic" is-open="status.open" is-disabled="status.isFirstDisabled"> <div templates="something"></div> <button ng-click="add()">Add</button> </accordion-group> </accordion> </div> </body> </html>的处理器专为图片而设计，因此无法处理视频。您收到的错误是ImageMagick无法将此文件识别为图像。很公平，这不是一个形象！

尽管如此，您可以自己编写一个后处理器，以及调用自定义处理类所需语法的paperclip's github page offers an example：

paperclip

这定义了名为has_attached_file :scan, :styles => { :text => { :quality => :better } }, :processors => [:ocr]的附件的变体，该变体是通过使用带有选项哈希text

的（假设的）Paperclip::Ocr类处理上传的文件而获得的。

确切的转换工具的选择取决于您，但您确实希望确保处理是异步完成的，而不是在通常的请求 - 响应周期内，您可能希望使用像Sidekiq，Que或Rails这样的后台队列'（4.2+）ActiveJob。

如何使用paperclip-Rails

2 个答案: