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• Sidekiq not processing video meta data using stremio-ffmpeg in rails app

  22 juillet 2017, par Arnold

  I am trying to process different video resolutions in background using carrierwave backgrounder, carrierwave-video and sidekiq. everything is working well (all the versions are created in background) except the meta data captured using stremio-ffmpeg. I am completely stuck and can’t figure out why the meta data are not being processed.

  below are my sample codes

  video_uploader.rb

  require 'streamio-ffmpeg'
  
  class VideoUploader < CarrierWave::Uploader::Base
  
  include CarrierWave::Video  # for your video processing
  
  include CarrierWave::Video::Thumbnailer
  
  include ::CarrierWave::Backgrounder::Delay
  
  # Include RMagick or MiniMagick support:
  
  # include CarrierWave::RMagick
  
  # include CarrierWave::MiniMagick
  
  # Choose what kind of storage to use for this uploader:
  
  storage :file
  
  # storage :fog
  
  #byebug
  
  process :save_metadata
  
  # Override the directory where uploaded files will be stored.
  
  # This is a sensible default for uploaders that are meant to be mounted:
  
  def store_dir
  
  default_path = "/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  
  # if FLAVOR == "uglive"
  
  #   default_path = "/uglive#{default_path}"
  
  # end
  
  "#{VIDEO_STORAGE}#{default_path}"
  
  end
  
  version :thumb do
  
  process thumbnail: [{format: 'png', quality: 10, size: 360, strip: false, 
  
  square: false, logger: Rails.logger}]
  
  def full_filename for_file
  
    png_name for_file, version_name
  
  end
  
  end
  
  def png_name for_file, version_name
  
  #remove all accents
  
  I18n.transliterate(%Q{#{version_name}_#
  
  {for_file.chomp(File.extname(for_file))}.png})
  
  end
  
  #save the video size in the model
  
  def save_metadata
  
  video = FFMPEG::Movie.new(file.file)
  
  if video.valid?
  
    model.duration = video.duration #(duration of the video in seconds)
  
    model.size = video.size #size is bytes
  
    model.video_codec = video.video_codec # "h264"
  
    model.width = video.width # 640 (width of the video in pixels)
  
    model.height = video.height # 480 (height of the video in pixels)
  
    model.audio_codec = video.audio_codec # "aac"
  
   end
  
   end
  
   # Different Video Resolutions
  
   version :res_480p, :do_not_delay => true do
  
   process encode_video: [:mp4, resolution: "720X480"]
  
   end
  
   version :res_720p do
  
   process encode_video: [:mp4, resolution: "1280X720"]
  
  end
  
  version :res_360p do
  
  process encode_video: [:mp4, resolution: "640x360"]
  
  end
  
  version :res_240p do
  
  process encode_video: [:mp4, resolution: "426x240"]
  
  end

  video.rb i called the mount uploader and background_process method (carrierwave video gem)

  mount_uploader :file, VideoUploader
  
  process_in_background :file

  when i run bundle exec sidekiq -q carrierwavethe version are created in background but the save_metadata method is never processed, so the duration,size,width, height, video_codec and audio_codec are nil in the Video model.

  I am stuck on this the whole day. any help will be highly welcome

• How can I reencode a video to match another's codec exactly ?

  24 janvier 2020, par Stephen Schrauger

  When I’m on vacation, I usually use our camcorder to record videos. Since they’re all the same format, I can use ffmpeg to concat them into one large, smooth video without re-encoding.

  However, sometimes I will use a phone or other camera to record a video (if the camcorder ran out of space/battery or was left at a hotel).

  I’d like to determine the codec, framerate, etc used by my camcorder and use those parameters to convert the phone vidoes into the same format. That way, I will be able to concatonate all the videos without re-encoding the camcorder videos.

  Using ffprobe, I found my camcorder has this encoding :

    Input #0, mpegts, from 'camcorderfile.MTS':
  
    Duration: 00:00:09.54, start: 1.936367, bitrate: 24761 kb/s
  
    Program 1 
  
      Stream #0:0[0x1011]: Video: h264 (High) (HDPR / 0x52504448), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 59.94 fps, 59.94 tbr, 90k tbn, 119.88 tbc
  
      Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 256 kb/s
  
      Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090), 1920x1080

  The phone (iPhone 5s) encoding is :

    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mov.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2017-01-02T03:04:05.000000Z
  
      com.apple.quicktime.location.ISO6709: +12.3456-789.0123+456.789/
  
      com.apple.quicktime.make: Apple
  
      com.apple.quicktime.model: iPhone 5s
  
      com.apple.quicktime.software: 10.2.1
  
      com.apple.quicktime.creationdate: 2017-01-02T03:04:05-0700
  
    Duration: 00:00:14.38, start: 0.000000, bitrate: 11940 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 11865 kb/s, 29.98 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        creation_time   : 2017-01-02T03:04:05.000000Z
  
        handler_name    : Core Media Data Handler
  
        encoder         : H.264
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-01-02T03:04:05.000000Z
  
        handler_name    : Core Media Data Handler
  
      Stream #0:2(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-01-02T03:04:05.000000Z
  
        handler_name    : Core Media Data Handler
  
      Stream #0:3(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-01-02T03:04:05.000000Z
  
        handler_name    : Core Media Data Handler

  I’m presuming that ffmpeg will automatically take any acceptable video format, and that I only need to figure out the output settings. I think I need to use -s 1920x1080 and -pix_fmt yuv420p for the output, but what other flags do I need in order to make the phone video into the same encoding as the camcorder video ?

  Can I get some pointers as to how I can translate the ffprobe output into the flags I need to give to ffmpeg ?

  Edit : Added the entire Input #0 for both media files.

• Merge selected separate video's and put the variable into a ffmpeg merge command

  28 juin 2017, par Fearhunter

  I am using the following method to cut a stream in pieces and save mp4 files on my harddisk.

  Method :

   public Process SliceStream()
  
          {
  
              var url = model.Url;
  
              var cuttime = model.Cuttime;
  
              var output = model.OutputPath;
  
  
  
              return Process.Start(new ProcessStartInfo
  
                  {
  
                      FileName = "ffmpeg.exe",
  
                      Arguments = $"-i \"{url}\" -c copy -flags +global_header -f segment -segment_time \"{cuttime}\" -segment_format_options movflags=+faststart -reset_timestamps 1 \"{output}\"",
  
                      UseShellExecute = false,
  
                      RedirectStandardOutput = true
  
                  }); 
  
  
  
          }

  The var variables are the user’s inputs on the front-end. This method is working fine.

  Now I have the separate video files loaded in a list on the front end. I want to merge this videos files into one. I was looking to the following link :

  Concatenate two mp4 files using ffmpeg

  I see there a 3 ways to merge my seperate video files. What is the best way to merge my video’s ? I was thinking about to this scenario :

  1 : the user select te video’s he wants to merge
  2 : the user click on the button merge
  3 : this array variable I can use into the ffmpeg command in reverse order

  ffmpeg -i '{reversed array input}' -codec copy output