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• Using dragonfly and ffmpeg to process a video in Rails

  26 novembre 2015, par Maikell

  I am writing a Ruby on Rails 4 Web application, that gives the user an image-upload functionality. For this I followed this tutorial, which is using the gems

  dragonfly
  
  jquery-fileupload-rails
  
  remotipart

  This is working fine.
  Now I want to extend the image-upload functionality, to upload videos as well. But unfortunately I’m stuck with it. Here is what I have tried so far :

  config/initializers/dragonfly.rb

  require 'dragonfly'
  
  
  
  # Configure
  
  Dragonfly.app.configure do
  
    plugin :imagemagick
  
  
  
    secret 'd045734b043b4383a246c5c8daf2d3e31217dc8b030f21861e4fd16c4b72d382'
  
  
  
    url_format '/media/:job/:name'
  
  
  
    datastore :file,
  
              root_path: Rails.root.join('uploads/images/'),
  
              server_root: Rails.root.join('uploads')
  
  end
  
  
  
  Dragonfly.app(:videos).configure do
  
    secret 'd045734b043b4383a246c5c8daf2d3e31217dc8b030f21861e4fd16c4b72d382'
  
  
  
    url_format "/media/:job/:name"
  
  
  
    datastore :file,
  
              root_path: Rails.root.join('uploads/videos/'),
  
              server_root: Rails.root.join('uploads')
  
  end
  
  
  
  # Logger
  
  Dragonfly.logger = Rails.logger
  
  
  
  # Mount as middleware
  
  Rails.application.middleware.use Dragonfly::Middleware
  
  
  
  # Add model functionality
  
  if defined?(ActiveRecord::Base)
  
    ActiveRecord::Base.extend Dragonfly::Model
  
    ActiveRecord::Base.extend Dragonfly::Model::Validations
  
  end

  models/video.rb

  class Video < ActiveRecord::Base
  
    dragonfly_accessor :video, app_name: :videos do
  
      storage_options do |video|
  
        { path: "videos/#{Video.gen_uuid}-#{video.name}.webm" }
  
      end
  
    end
  
  end

  I upload the video with ajax. It is succesfully saved in the systems /tmp-directory. Than in the video-controller I call

  @video = Video.new[video_params]
  
  @video.save

  Now the video-params are correctly saved in the database, but the video is not saved in the given directory /uploads/videos Also my goal is, to process the video with ffmpeg, to convert it to a webm. ffmpeg is installed in the system and converting a video on the command line works fine.

  • But how do I get dragonfly to start the conversion process and save the video in the rails project ? Where do I have to put the ffmpeg-commands to dragonfly ?
  • Why does dragonfly not save the video in the directory uploads/videos ?

  Everything works fine with images and imagemagick. Only videos are causing problems.

• Swift Process Fails to Properly Send Metadata Args to FFMPEG

  30 avril 2019, par Ryan Stone

  I’m writing a Swift Process that concatenates a series of audio files using FFMPEG and libfdk_aac. The concatenation works, but when I pass metadata information through the process I get a Unrecognized option 'metadata artist="ff"' ... Option not found error.

  When debugging, if I use a breakpoint and print using e print(args.joined(separator: " ")) I’m able to take the exact output and paste it in the console, FFMPEG runs and doesn’t throw an error.

  I’m assuming there’s an oddity with how Swift process works, but even there I’ve tested and I’m stumped. I created a ruby script that took the args and looped over them and printed them and there is nothing given to the script that is unexpected. (Output below)

  Swift Process

  private func export() {
  
          guard let ffmpegPath = Bundle.main.path(forResource: "ffmpeg", ofType: "") else { return }
  
  
  
  
  
          var task = Process()
  
          task.launchPath = ffmpegPath
  
  
  
          let args: [String] = [
  
              "-i",
  
              #"concat:"\#(fileContents)""#,
  
              title(),
  
              artist(),
  
              narrator(),
  
              "-c:a",
  
              "libfdk_aac",
  
              "-vn",
  
              #"\#(exportPath)\#(exportFilename)"#
  
          ].compactMap { $0 }
  
  
  
          task.arguments = args
  
  
  
          var pipe = Pipe()
  
          setStdErrPipe(pipe: &pipe, task: &task)
  
          setTerminationNotification(task: task)
  
  
  
          task.launch()
  
      }
  
  
  
      func title() -> String? {
  
          guard metadata.titleText != "" else {
  
              return nil
  
          }
  
          return #"-metadata title="\#(metadata.titleText)""#
  
      }
  
  
  
      func artist() -> String? {
  
          guard metadata.authorText != "" else { return nil }
  
          return #"-metadata artist="\#(metadata.authorText)""#
  
      }
  
  
  
      func narrator() -> String? {
  
          guard metadata.narratorText != "" else { return nil }
  
          return #"-metadata album_artist="\#(metadata.narratorText)""#
  
      }

  Arg tester Output

  -i
  
  concat:"/Users/sharkmaul/Downloads/Bringing Up BÈbÈ/Bringing Up BÈbÈ-Part01.mp3|/Users/sharkmaul/Downloads/Bringing Up BÈbÈ/Bringing Up BÈbÈ-Part02.mp3"
  
  -metadata title="title"
  
  -metadata artist="author"
  
  -metadata album_artist="narrator"
  
  -c:a
  
  libfdk_aac
  
  -vn
  
  /Users/sharkmaul/Desktop/068F4F43-89EE-47F6-838D-7AD3E02E7F8A.m4a

• I can't install ffmpegs (dependencies) - error with doxygen [mac 10.12.6 Sierra]

  12 septembre 2022, par Lo-Fi Junky

  It installed about 70% of the dependencies it needed to get ffmpegs going, but it got stuck at installing 'doxygen'.

  


  This is the error I got :

  


  ==> Installing dependencies for ffmpeg: doxygen, little-cms2, openjpeg, opus, rust, libgit2, cargo-c, rav1e, flac, libsndfile, libsamplerate, rubberband, sdl2, swig, llvm, snappy, speex, srt, leptonica, libb2, lz4, libarchive, tesseract, theora, x264, x265, xvid, docbook, boost, source-highlight, asciidoc, docbook-xsl, libyaml, ruby, asciidoctor, gnu-getopt, xmlto, libsodium, zeromq and zimg&#xA;==> Installing ffmpeg dependency: doxygen&#xA;==> cmake ..&#xA;==> make&#xA;Last 15 lines from /Users/macbook/Library/Logs/Homebrew/doxygen/02.make:&#xA;In file included from /tmp/doxygen-20220723-61533-5m5mdv/doxygen-1.9.4/src/outputlist.h:25:&#xA;/tmp/doxygen-20220723-61533-5m5mdv/doxygen-1.9.4/src/searchindex.h:29:10: fatal error: &#x27;variant&#x27; file not found&#xA;#include <variant>&#xA;         ^~~~~~~~~&#xA;1 error generated.&#xA;make[2]: *** [src/CMakeFiles/doxymain.dir/__/generated_src/code.cpp.o] Error 1&#xA;make[1]: *** [src/CMakeFiles/doxymain.dir/all] Error 2&#xA;make[1]: *** Waiting for unfinished jobs....&#xA;[ 46%] Linking CXX static library ../lib/libvhdlparser.a&#xA;cd /tmp/doxygen-20220723-61533-5m5mdv/doxygen-1.9.4/build/vhdlparser &amp;&amp; /usr/local/Cellar/cmake/3.23.2/bin/cmake -P CMakeFiles/vhdlparser.dir/cmake_clean_target.cmake&#xA;cd /tmp/doxygen-20220723-61533-5m5mdv/doxygen-1.9.4/build/vhdlparser &amp;&amp; /usr/local/Cellar/cmake/3.23.2/bin/cmake -E cmake_link_script CMakeFiles/vhdlparser.dir/link.txt --verbose=1&#xA;/usr/bin/ar qc ../lib/libvhdlparser.a CMakeFiles/vhdlparser.dir/CharStream.cc.o CMakeFiles/vhdlparser.dir/ParseException.cc.o CMakeFiles/vhdlparser.dir/Token.cc.o CMakeFiles/vhdlparser.dir/TokenMgrError.cc.o CMakeFiles/vhdlparser.dir/__/generated_src/VhdlParser_adj.cc.o CMakeFiles/vhdlparser.dir/VhdlParserTokenManager.cc.o&#xA;/usr/bin/ranlib ../lib/libvhdlparser.a&#xA;[ 46%] Built target vhdlparser&#xA;make: *** [all] Error 2&#xA;&#xA;Do not report this issue to Homebrew/brew or Homebrew/core!&#xA;&#xA;&#xA;Error: You are using macOS 10.12.&#xA;We (and Apple) do not provide support for this old version.&#xA;You will encounter build failures with some formulae.&#xA;Please create pull requests instead of asking for help on Homebrew&#x27;s GitHub,&#xA;Twitter or any other official channels. You are responsible for resolving&#xA;any issues you experience while you are running this&#xA;old version.&#xA;</variant>

  


  Can someone please help me am not sure what it is, that I am supposed to do.