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  • Qu’est ce qu’un éditorial

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    Ecrivez votre de point de vue dans un article. Celui-ci sera rangé dans une rubrique prévue à cet effet.
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    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
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  • No such file or directory Error with FFMPEG screenshot and CarrierWave custom model method

    9 juillet 2013, par dodgerogers747

    I am using AWS CORS to upload videos to my site, all of which works as planned.

    I have the following model method which runs as an after_create callback (for speed) to take a screenshot from the video file on AWS. I plan to move this out into a delayed job but I don't think this will solve this particular issue. Please advise if mistaken.

    I use FFMPEG to take a screenshot from the AWS self.file location, I then send the file to CarrierWave by saving the file to self.screenshot where it is uploaded to AWS.

    Approx. 50% of the time it errors out with Errno::ENOENT - No such file or directory for the location of the screenshot image.

    How can I rectify my code to remove this error and how come it only occurs around 50% of the time ? If anyone needs more code just shout.

    video.rb

    after_create :take_screenshot
    

    
mount_uploader :screenshot, ImageUploader
    

    
  def take_screenshot
    
    location = "#{Rails.root}/public/uploads/tmp/screenshots/#{unique}_#{File.basename(file)}.jpg"
    
    system `ffmpeg #{log_level} -i #{self.file} -ss 00:00:0#{time_frame} -vframes 1 #{location}`
    
    logger.debug "Trying to take screenshot from #{self.file}"
    
    #pass the actual file to CarrierWave to handle the image upload
    
    self.screenshot = File.open(location)
    
    self.save
    
    logger.debug "Deleting tmp file: #{location}: #{File.delete(location)}" if self.screenshot.present?
    
  end
    

    
def unique
    
    (0..6).map{(65+rand(26)).chr}.join
    
  end
    

    
def log_level
    
    "-loglevel panic"
    
  end
    

    
  def time_frame
    
    rand(0..3)
    
  end

    Stack trace :

    Started POST "/videos" for 127.0.0.1 at 2013-07-10 03:58:49 +0800
    
Processing by VideosController#create as JS
    
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"6M1Ia+Ag2E3HVKH2PO/p7jewxSpMPdWeVHGA933Bzjw=", "video"=>{"file"=>"http://bucketname.s3.amazonaws.com/uploads/video/file/671a87fb-91de-4eaf-a38a-1b25c51798e5/Good_7iron.m4v"}}
    
  User Load (0.3ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 9 LIMIT 1
    
   (0.1ms)  BEGIN
    
  SQL (0.2ms)  INSERT INTO `videos` (`created_at`, `file`, `question_id`, `screenshot`, `updated_at`, `user_id`) VALUES (&#39;2013-07-09 19:58:49&#39;, &#39;http://bucketname.s3.amazonaws.com/uploads/video/file/671a87fb-91de-4eaf-a38a-1b25c51798e5/Good_7iron.m4v&#39;, NULL, NULL, &#39;2013-07-09 19:58:49&#39;, 9)
    
Trying to take screenshot from http://bucketname.s3.amazonaws.com/uploads/video/file/671a87fb-91de-4eaf-a38a-1b25c51798e5/Good_7iron.m4v
    
   (0.8ms)  ROLLBACK
    
Completed 500 Internal Server Error in 3550ms
    

    
Errno::ENOENT - No such file or directory - /Users/me/rails/project/public/uploads/tmp/screenshots/WCACLIC_Good_7iron.m4v.jpg:
    
  app/models/video.rb:24:in `initialize&#39;
    
  app/models/video.rb:24:in `open&#39;
    
  app/models/video.rb:24:in `take_screenshot&#39;

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