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  • Automated installation script of MediaSPIP

    25 avril 2011, par

    To overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
    You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
    The documentation of the use of this installation script is available here.
    The code of this (...)

  • Taille des images et des logos définissables

    9 février 2011, par

    Dans beaucoup d’endroits du site, logos et images sont redimensionnées pour correspondre aux emplacements définis par les thèmes. L’ensemble des ces tailles pouvant changer d’un thème à un autre peuvent être définies directement dans le thème et éviter ainsi à l’utilisateur de devoir les configurer manuellement après avoir changé l’apparence de son site.
    Ces tailles d’images sont également disponibles dans la configuration spécifique de MediaSPIP Core. La taille maximale du logo du site en pixels, on permet (...)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

Sur d’autres sites (3234)

  • Why seek on ts file is so slow ?

    2 juillet 2015, par skipper

    I am dealing with a ts file, following is ffprobe output :

    ffprobe version N-45589-gb6a0b8b-   http://johnvansickle.com/ffmpeg/    Copyright (c) 2007-2014 the FFmpeg developers
    
  built on Aug 28 2014 02:30:32 with gcc 4.8 (Debian 4.8.3-9)
    
  configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --disable-ffserver --enable-libass --enable-gnutls --cc=gcc-4.8
    
  libavutil      54.  7.100 / 54.  7.100
    
  libavcodec     56.  0.101 / 56.  0.101
    
  libavformat    56.  3.100 / 56.  3.100
    
  libavdevice    56.  0.100 / 56.  0.100
    
  libavfilter     5.  0.103 /  5.  0.103
    
  libswscale      3.  0.100 /  3.  0.100
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  0.100 / 53.  0.100
    
[hevc @ 0x298b4a0] No start code is found.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] No start code is found.
    
    Last message repeated 2 times
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] No start code is found.
    
    Last message repeated 7 times
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] No start code is found.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[hevc @ 0x298b4a0] PPS id out of range: 0
    
[hevc @ 0x298b4a0] Error parsing NAL unit #2.
    
[mpegts @ 0x2987560] decoding for stream 0 failed
    
[mpegts @ 0x2987560] Could not find codec parameters for stream 0 (Video: hevc ([36][0][0][0] / 0x0024)): unspecified size
    
Consider increasing the value for the 'analyzeduration' and 'probesize' options
    
Input #0, mpegts, from 'mp4box-jlsj-4k.ts':
    
  Duration: 00:02:15.00, start: 0.001111, bitrate: 31116 kb/s
    
  Program 1
    
    Stream #0:0[0x65]: Video: hevc ([36][0][0][0] / 0x0024), 25 tbr, 90k tbn, 90k tbc
    
    Stream #0:1[0x66]: Audio: eac3, 48000 Hz, 5.1(side), fltp, 448 kb/s

    The problem I’m having is that seeking on this file is extremely slow, it took more than 1 minute to complete seek operation.

    This ts file is 500MB in size, has 2,793,052 ts packets, 2,750,469 video packets, 137 video packets with random_acces_indicator.
    What’s the possible reason for the slow seek ? Why is ffmpeg reporting these errors ? What do I need to do for the analysis ?

  • why does concatting multiple videos renders no audio ?

    19 juin 2015, par dd-s

    As the title tells, I’m having issues with FFMPEG concat. It’s not really pertinent to the problem, but perhaps helpful to getting me the correct answer.

    app/models/event.rb
    

    
class Event < ActiveRecord::Base
    
  has_many :videos
    
end
    app/models/video.rb
    

    
class Video < ActiveRecord::Base
    
  belongs_to :event
    
end
    app/jobs/video_concatenator_job.rb
    

    
class VideoConcatenatorJob < ActiveJob::Base
    
  queue_as :default
    
  attr_reader :event
    

    
  def perform(event_id)
    
    @event = Event.find event_id
    
    concatenator = VideoConcatenate.new(video_paths, output_name)
    
    concatenator.call
    
  end
    

    
  private
    
    def output_name
    
      event.id
    
    end
    

    
    def video_paths
    
      [intro_video.to_s] + event.videos.live.map { |video| video.event_video.download.path }
    
    end
    

    
    def intro_video
    
      image = annotate_image
    
      `ffmpeg -loop 1 -i "#{image}" -c:v libx264 -t 5 -pix_fmt yuv420p -y -vf scale=320:240 "#{output_name}"`
    
    end
    

    
    def annotate_image
    
      return event.intro_image.download.path if event.intro_text.blank?
    
      image = MiniMagick::Image.open event.intro_image.download.path
    
      output = Rails.root.join('tmp', 'ffmpeg', 'intro', "#{event.id}.jpg")
    
      image.combine_options do |c|
    
        . . .
    
        c.annotate '0', "#{event.intro_text}"
    
        . . .
    
      end
    
      image.write output.to_s
    
      output
    
    end
    

    

    
end
    app/models/video_concatenate.rb
    

    
class VideoConcatenate
    
  attr_accessor :input
    
  attr_reader :file_name
    

    
  def initialize(input, file_name)
    
    @input = input
    
    @file_name = file_name
    
  end
    

    
  def call
    
    `ffmpeg -i "concat:#{list_transcoder}" -c copy -bsf:a aac_adtstoasc "#{output}"`
    
  end
    

    
  private
    

    
    def output
    
      Rails.root.join("tmp", "ffmpeg", "concatenated", file_name)
    
    end
    

    
    def list_transcoder
    
      output_array = []
    
      # first transcoding them to mpeg transport stream
    
      input.map(&:to_s).each_with_index do |video, index|
    
        stream = finished_video_path("concatenations", "#{file_name}-#{index}.ts")
    
        `ffmpeg -i "#{video}" -y -c copy -bsf:v h264_mp4toannexb -f mpegts "#{stream}"`
    
        output_array << stream
    
      end
    
      output_array.join("|")
    
    end
    
end

    So when the job is performed. It takes an intro_image and intro_text and annotates that image with MiniMagick. It then takes that annotated image and turns it into a 5 second .mp4. Then it takes that annotated intro video and the video files associated with the event, and concatenated them all into one single .mp4.

    If I take out [intro_video.to_s] + from VideoConcatenatorJob.video_paths then the issue doesn’t happen. something must be wrong with my annotated video. Any help is extremely appreciated.

  • ac3dec_fixed : always use the USE_FIXED=1 variant of the AC3DecodeContext

    13 mars 2015, par Andreas Cadhalpun
    ac3dec_fixed : always use the USE_FIXED=1 variant of the AC3DecodeContext

    The AC3DecodeContext has a float (USE_FIXED=0) and an integer
    
(USE_FIXED=1) variant, both of which can be present in the same binary.
    
This is not only very confusing, but it also breaks horribly, when one
    
variant is used by code expecting the other.
    

    This currently happens, because eac3dec.c is only compiled for the float
    
variant, but also used from ac3dec_fixed.c, which uses the integer
    
variant.
    

    The result is memory corruption, leading to crashes.
    

    So compile eac3dec.c once for each variant and adapt it, so that it
    
works with the integer variant.
    

    A loss of precission and scaling bug has been fixed by the committer
    
Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] libavcodec/Makefile
    • [DH] libavcodec/ac3dec.h
    • [DH] libavcodec/ac3dec_fixed.c
    • [DH] libavcodec/ac3dec_float.c
    • [DH] libavcodec/eac3dec.c

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