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• Revision f085d128f7 : Remove brightness weighting in two pass. This code dates from the ancient past

  23 mai 2014, par Paul Wilkins

  Changed Paths :
   Modify /vp9/encoder/vp9_firstpass.c

  
  
  Remove brightness weighting in two pass.

  This code dates from the ancient past and
  applied an error score weighting based on pixel
  brightness. This not seem to be providing any
  benefit metrics wise and could be making some
  visual issues in dark frames worse.

  The field is left in place in the FIRSTPASS_STATS data
  structure in this patch, pending changes to unit tests that
  use a pre-defined first pass file.

  Change-Id : Id50f04205230234858e7548ce523f11acaf3567d

• FFMPEG Decoding - Memory Leak

  1er mai 2013, par Spamdark

  Developing an application for a test, I encountered an error. Meanwhile the packets were proccessed, I got a very horrible problem, a memory leak.

  The av_free_packet is applied correctly, I think (See the code). When I run the app, the memory grows up to 500MB meanwhile it's playing the audio file, that's not normal. VLC or WMplayer (Windows Media Player) just wastes 30/20mb reading that file.

  Here is the code :

  static AVPacket pkt;
  
  static uint8_t *audio_pkt_data = NULL;
  
  static int audio_pkt_size = 0;
  
  static AVFrame frame;
  
  static bool first_time = true;
  
  
  
  if(first_time){
  
      first_time=false;
  
  }
  
  
  
  int len1, data_size = 0;
  
  
  
  for(;;){
  
      bool do_rt = false;
  
  
  
      while(audio_pkt_size > 0){
  
          int obt_frame = 0;
  
  
  
          len1 = avcodec_decode_audio4(_audio_ccontext,&frame,&obt_frame,&pkt);
  
          if(len1 < 0){
  
              audio_pkt_size = 0;
  
              break;
  
          }
  
          audio_pkt_data+=len1;
  
          audio_pkt_size-=len1;
  
          if(obt_frame){
  
              data_size = av_samples_get_buffer_size(NULL,channel_count,sample_fr,_audio_ccontext->sample_fmt,1);
  
              memcpy((int16_t*)audio_buf,frame.data[0],data_size);
  
  
  
          }
  
          if(data_size <= 0){
  
              continue;
  
          }
  
          do_rt = true;
  
      }
  
  
  
      if(pkt.data){
  
          //MessageBox(0,"hi","Hi",MB_OK); // This is only for test if the app si reaching this av_free_packet
  
          av_free_packet(&pkt);
  
      }
  
  
  
      if(do_rt){
  
          return data_size;
  
      }
  
  
  
      // Try to get a new packet
  
      if(!audio_packets.empty()){
  
          WaitForSingleObject(Queue_Audio_Mutex,INFINITE);
  
              pkt = *audio_packets.front();
  
              audio_packets.pop();
  
          ReleaseMutex(Queue_Audio_Mutex);
  
  
  
          audio_pkt_size = pkt.size;
  
          audio_pkt_data = pkt.data;
  
      }else{
  
          return -1;
  
      }
  
  }
  
  return 0;
  
  }

  I would appreciate your help. Thank you very much.

• using node-fluent-ffmpeg to transcode with ffmpeg on windows not working

  25 juillet 2015, par jansmolders86

  I’m trying to use the module node-fluent-ffmpeg (https://github.com/schaermu/node-fluent-ffmpeg) to transcode and stream a videofile. Since I’m on a Windows machine, I first downloaded FFMpeg from the official site (http://ffmpeg.zeranoe.com/builds/). Then I extracted the files in the folder C :/FFmpeg and added the path to the system path (to the bin folder to be precise). I checked if FFmpeg worked by typing in the command prompt : ffmpeg -version. And it gave a successful response.

  After that I went ahead and copied/altered the following code from the module (https://github.com/schaermu/node-fluent-ffmpeg/blob/master/examples/express-stream.js) :

  app.get('/video/:filename', function(req, res) {
  
  res.contentType('avi');
  
  console.log('Setting up stream')
  
  
  
  var stream = 'c:/temp/' + req.params.filename
  
  var proc = new ffmpeg({ source: configfileResults.moviepath + req.params.filename, nolog: true, timeout: 120, })
  
      .usingPreset('divx')
  
      .withAspect('4:3')
  
      .withSize('640x480')
  
      .writeToStream(res, function(retcode, error){
  
          if (!error){
  
              console.log('file has been converted succesfully',retcode);
  
          }else{
  
              console.log('file conversion error',error);
  
          }
  
      });
  
  });

  I’ve properly setup the client with flowplayer and tried to get it running but
  nothing happens. I checked the console and it said :

  file conversion error timeout

  After that I increased the timeout but somehow, It only starts when I reload the page. But of course immediately stops because of the page reload. Do I need to make a separate node server just for the transcoding of files ? Or is there some sort of event I need to trigger ?

  I’m probably missing something simple but I can’t seem to get it to work.
  Hopefully someone can point out what I’ve missed.

  Thanks