Recherche avancée

Sur d’autres sites (9607)

• Nomenclature #4519 (Nouveau) : Renommage de terminologie (blacklist / whitelist)

  13 juillet 2020

  En lisant la compilation [PHP Annotated – June 2020](https://blog.jetbrains.com/phpstorm/2020/06/php-annotated-june-2020/) on tombe sur ce point :

  [[RFC] Change terminology to ExcludeList](https://wiki.php.net/rfc/change-terminology-to-excludelist) — The topic of renaming offensive terms has not been overlooked by the PHP world either. There have been [heated discussions](https://externals.io/message/110515) in the Internals.
  In the PHP core, the change affects only one thing : the configuration directive `opcache.blacklist_filename` should be renamed to `opcache.exclude_list_filename`.
  Many other PHP tools have already made changes in this regard : [PHPUnit](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-9.3.md#930---2020-08-07), [Drupal](https://www.drupal.org/project/drupal/issues/2993575), [Xdebug](https://github.com/xdebug/xdebug/commit/63b43b51e43b794cf8cd740e54089b2b7320fbe1), [Yii](https://github.com/yiisoft/yii2/pull/18104), [Composer](https://github.com/composer/composer/pull/8957) (+ [working with non-master Git branches](https://blog.packagist.com/composer-and-default-git-branches/)).

  C’est certainement intéressant aussi de songer à ces renommages chez nous également, utilisés à quelques endroits.

• How to use qt-faststart in ffmpeg arguments while merging 2 flv files into 1 mp4 format

  21 novembre 2014, par Mohsin Sharpen

  I want to do Pseudo Streaming of an mp4 file generated from 2 different flvs. For that I am using qt-faststart tool in ffmpeg. My generated file is according to my requirement but still Pseudo Streaming is not working.

  Here is my code which is written in Ruby on Rail which merge 2 different flv files and then move them to the final location after generating final mp4 format.

  class VideoProcess < BaseJob
  
  @queue = :video_process
  
  @config_file = 'video_process'
  
  
  
  def self.perform(session_name)
  
      new(session_name).video_merge
  
  end
  
  
  
  def initialize(session_name)
  
      @session_name = session_name
  
      @candidate_file = "#{@session_name}candidate.flv"
  
      @expert_file = "#{@session_name}expert.flv"
  
  
  
      load_config
  
  end
  
  
  
  def video_merge()
  
      left_video = @config[:src_path]+@candidate_file
  
      right_video = @config[:src_path]+@expert_file
  
  
  
      unless File.exists?(left_video)
  
          raise "The file '#{left_video}' does not exist!"
  
      end
  
  
  
      unless File.exists?(right_video)
  
          raise "The file '#{right_video}' does not exist!"
  
      end
  
  
  
      prepare_output_dir @config[:dest_path]
  
  
  
      output_video = "#{@config[:dest_path]}#{@session_name}.#{@config[:output_ext]}"
  
  
  
      filter = generate_filter
  
  
  
      args = strip_spaces %Q|
  
          -i "#{left_video}"
  
          -i "#{right_video}"
  
          -filter_complex "#{filter}"
  
          -map “[left+right]”
  
          -y
  
          -movflags faststart
  
          #{@config[:output_format]}
  
          #{output_video}
  
      |
  
  
  
      command = "#{@config[:command]} #{args} 2>&1" #2>&1 - move error to output
  
  
  
      output = `#{command}`
  
  
  
      puts output
  
  
  
      unless $?.success?
  
          raise output
  
      end
  
  
  
      Resque.enqueue(FileMove, output_video)
  
  
  
      #File.delete left_video, right_video
  
  
  
  end
  
  
  
  def generate_filter
  
      strip_spaces %Q!
  
          nullsrc=size=1040x400 [background];[0:v] setpts=PTS-STARTPTS,
  
          scale=520x400[left];[1:v]setpts=PTS-STARTPTS,scale=520x400[right];
  
          [background][left]overlay=shortest=1[background+left];
  
          [background+left][right]overlay=shortest=1:x=520 [left+right];
  
          [0:1] [1:1] amerge
  
      !
  
  end
  
  
  
  def load_config
  
      super
  
      @config.merge!({
  
          command: @config[:ffmpeg],
  
          padding: @config[:video_w] + @config[:video_space],
  
          overlay: @config[:video_w] * 2 + @config[:video_space]
  
      })
  
  end
  
  # Strip multi spaces to one and remove new line symbol
  
  def strip_spaces(string)
  
      string.gsub("\n",'').gsub(/\s+/, ' ').strip!
  
  end

  end

  Can some one see my code and check if I have set the flag -movflags faststart properly or I need to do something else.

  I am stuck badly as I am not good at ruby on rail/ffmpeg thing.
  Your help will be really appreciated for me in this regard.

• Evolution of Multimedia Fiefdoms

  1er octobre 2014, par Multimedia Mike — General

  I want to examine how multimedia fiefdoms have risen and fallen through the years.

  
  
  

  Back in the day, the multimedia fiefdoms were built around the formats put forth by competing companies : there was Microsoft/WMV, Apple/MOV, and Real/RM as the big contenders. On2 always wanted to be a player in this arena but could never quite catch a break. A few brave contenders held the line for open source and also for the power users who desired one application that could handle everything (my original motivation for wanting to get into multimedia hacking).

  The computer desktop was the battleground for internet-based media stream. Whatever happened to those days ? Actually, if memory serves, Flash-based video streaming stepped on all of them.

  Over the last 6-7 years, the battleground has expanded to cover mobile devices, where Flash’s impact has… lessened. During this time, multimedia technology pretty well standardized on a particular stack, namely, the MPEG (MP4/H.264/AAC) stack.

  The belligerents in this war tried for years to effectively penetrate new territory, namely, the living room where the television lived. This had been slowgoing for years due to various user interface and content issues, but steadily improved.

  Last April, Amazon announced their entry into the set-top box market with the Fire TV. That was when it suddenly crystallized for me that the multimedia ecosystem has radically shifted. Now, the multimedia fiefdoms revolve around access to content via streaming services.

  Off the top of my head, here are some of the fiefdoms these days (fiefdoms I have experience using) :

  • Netflix (subscription streaming)
  • Amazon (subscription, rental, and purchased streaming)
  • Hulu Plus (subscription streaming)
  • Apple (rental and purchased media)

  I checked some results on Can I Stream.It ? (which I refer to often) and found a bunch more streaming fiefdoms such as Google (both Play and YouTube, which are separate services), Sony, Xbox 360, Crackle, Redbox Instant, Vudu, Target Ticket, Epix, Sony, SnagFilms, and XFINITY StreamPix. And surely, these are probably just services available in the United States ; I know other geographical regions have their own fiefdoms.

  What happened ?

  When I got into multimedia hacking, there were all these disparate, competing ecosystems. As a consumer, I didn’t care where the media came from, I just wanted to play it. That’s what inspired me to work on open source multimedia projects. Now I realize that I have the same problem 10-15 years later : there are multiple competing ecosystems. I might subscribe to fiefdoms X and Y, but am frustrated to learn that something I’d like to watch is only available through fiefdom Z. Very few of these fiefdoms can be penetrated using open source technology.

  I’m not really sure about the point about this whole post. Multimedia technology seems really standardized these days. But that’s probably just my perspective because I have spent way too long focusing on a few areas of multimedia technology such as audio and video coding. It’s interesting that all these services probably leverage the same limited number of codecs. Their differentiation comes from the catalog of content that each is able to license for streaming. There are different problems to solve in the multimedia arena now.