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• RoutingError No route matches GET videos/original/missing.png

  4 novembre 2015, par D.Graves

  Okay so Im having an issue uploading videos using paperclip av transcoder. Im getting just a blank black image for my video and cant play anything. So no error pops up online but on my GitBash I see an ActionController Routing Error.

  This is the Error I see in my Gitbash
  

  My model that has the video :

  class Pin < ActiveRecord::Base
  
   belongs_to :user
  
   has_attached_file :video, :styles => {
  
  :medium => { :geometry => "640x480", :format => 'mp4' },
  
  :thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10 }
  
   }, :processors => [:transcoder]
  
  
  
  validates_attachment_content_type :video, :content_type => ["video/mp4",     "video.mov", "video/mpeg","video/mpeg4", "image/jpg", "image/jpeg"]
  
  
  
  end

  My show view for the video :

  <%= video_tag @pin.video.url %>
  
  
  
  <p>
  
   <strong>Description:</strong>
  
   &lt;%= @pin.description %>
  
  </p>
  
  
  
  &lt;% if @pin.user == current_user %>
  
  &lt;%= link_to 'Edit', edit_pin_path(@pin) %>
  
  &lt;% end %>
  
  &lt;%= link_to 'Back', pins_path %>

  I believe I installed ffmpeg correct and here is what it shows on my Gitbash for my version of ffmpeg

  

  I also have the newest version of paperclip and paperclip av transcoder installed. Am I just missing a route ? If you all need any other code to maybe help just let me know and ill post it

• FFMPEG scene detection : overlay original frame number

  21 décembre 2020, par Fugi

  I'm able to extract all frames that are not similar to the previous frame from a video file using ffmpeg -i video.mp4 -vf "select=gt(scene\,0.003),setpts=N/(30*TB)" frame%d.jpg (source)

  


  I would like to overlay the frame number onto each selected frame. I tried adding drawtext=fontfile=/Windows/Fonts/Arial.ttf: text='frame\: %{frame_num}': x=(w-tw)/2: y=h-(2*lh): fontcolor=white: box=1: boxcolor=0x00000000@1: fontsize=30 to the filter after select and setpts, however %frame_num returns 1, 2, 3, ... (source)

  


  If I put drawtext before select and setpts, I get something like 16, 42, 181, ... as frame numbers (which is exactly what I want), but since the scene detection runs after adding the text overlay, changes in the overlay may be detected as well.

  


  Is it possible to do the scene detection and overlay independently from another ? [in] split [out0][out1] can be used to apply filters separately, but I don't know how to "combine" the results again.

  


• Build Live Audio Stream Player

  5 décembre 2011, par Kurt

  For an internship project i've been trying to develop a simple audio player for audio live stream.

  Currently i'm using a homemade three buffering (of 1/3 s each) solution played by QAudioOutput, which recall himself after finished his reading.

  void VideoServer::getBuf(QBuffer * p_buf)
  
  {
  
      audio_chunk*    ac = NULL;
  
      std::vector v;
  
  
  
      v.clear();
  
      for (int i = 0; i < 20;)
  
      {
  
          ac = _audioPreviewSharedData->deQueueAudio();
  
          if (ac)
  
          {
  
              v.insert(v.end(), ac->v_buf.begin(), ac->v_buf.end());
  
              i++;
  
              delete ac;
  
          }
  
          else
  
              usleep(50000);
  
      }
  
      p_buf->close();
  
      p_buf->setData((const char *)(&v[0]), v.size()*2);
  
      p_buf->open(QIODevice::ReadOnly);
  
  }

  -

  void VideoServer::slot_launchAudioPreviewBuffering()
  
  {
  
      getBuf(_buf1);
  
      getBuf(_buf2);
  
      _state = 2;
  
      connect(_audioPreviewTimer, SIGNAL(timeout()), this, SLOT(slot_audioPreviewBuffering()));
  
      _audioPreviewTimer->start(0);
  
      connect(_audioOut, SIGNAL(stateChanged(QAudio::State)), this, SLOT(finishedPlaying(QAudio::State)));
  
  }

  -

  void VideoServer::finishedPlaying(QAudio::State state)
  
  {
  
      if(state == QAudio::IdleState) {
  
          slot_audioPreviewBuffering();
  
      }
  
  }

  -

  void VideoServer::slot_audioPreviewBuffering()
  
  {
  
      switch (_state) {
  
      case 0:
  
          {
  
              _audioOut->start(_buf2);
  
              getBuf(_buf1);
  
              _state = 1;
  
              break;
  
          }
  
      case 1:
  
          {
  
              _audioOut->start(_buf3);
  
              getBuf(_buf2);
  
              _state = 2;
  
              break;
  
          }
  
      case 2:
  
          {
  
              _audioOut->start(_buf1);
  
              getBuf(_buf3);
  
              _state = 0;
  
              break;
  
          }
  
      }
  
  }

  But i'm suffering of choppy sound (little interruption between audio chunk).

  How to play this flux without interruption () and with a reasonable delay between audio and video (less 1s) ? Is there a best way ? Am i doing wrong ?

  Thank you !