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• Explicit deinitialization of progress listeners.

  14 octobre 2018, par blueimp

  Explicit deinitialization of progress listeners.
  This addresses a memory leak with Microsoft Edge.
  Thanks @butonic for the report, investigation and fix.
  Closes #3508

• avformat/mpegtsenc : Fix mpegts_write_pes() for private_stream_2 and other types

  25 avril 2021, par zheng qian

  avformat/mpegtsenc : Fix mpegts_write_pes() for private_stream_2 and other types
  According to the PES packet definition defined in Table 2-17 of ISO_IEC_13818-1
  
  specification, some fields like PTS/DTS or pes_extension could only appears if
  
  the stream_id meets the condition :
  if (stream_id != 0xBC &&  // program_stream_map
  
      stream_id != 0xBE &&  // padding_stream
  
      stream_id != 0xBF &&  // private_stream_2
  
      stream_id != 0xF0 &&  // ECM
  
      stream_id != 0xF1 &&  // EMM
  
      stream_id != 0xFF &&  // program_stream_directory
  
      stream_id != 0xF2 &&  // DSMCC_stream
  
      stream_id != 0xF8)    // ITU-T Rec. H.222.1 type E stream
  And the following stream_id types don't have fields like PTS/DTS :
  else if ( stream_id == program_stream_map
  
  || stream_id == private_stream_2
  
  || stream_id == ECM
  
  || stream_id == EMM
  
  || stream_id == program_stream_directory
  
  || stream_id == DSMCC_stream
  
  || stream_id == ITU-T Rec. H.222.1 type E stream ) 
  
      for (i = 0 ; i < PES_packet_length ; i++) 
  
          PES_packet_data_byte
  
      
  
  
  Current implementation skipped the check of stream_id causing some kind of
  
  streams like private_stream_2 to be incorrectly written with actually a
  
  private_stream_1-like PES header with PTS/DTS field. For example, Japan DTV
  
  transmits news and alerts through ARIB superimpose that utilizes
  
  private_stream_2 still could not be remuxed correctly for now.
  This patch set fixes the remuxing for private_stream_2 and
  
  other stream_id types.
  Signed-off-by : zheng qian <xqq@xqq.im>
  
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/mpegtsenc.c

• Play HLS segments through Media source extensions

  11 février 2018, par ler

  I got a list of m4s and init.mp4 from this FFMPEG command

  ffmpeg -i bunny.mp4 -f hls -hls_segment_type fmp4 -c:v copy playlist.m3u8

  I send those chunks using Socketand try to play them through MSE.
  When i send them in this order :

  init.mp4 + playlist0.m4s + playlist1.m4s ...

  They play without any problem, But when i want to start from the chunk number 3 meaning init.mp4 + playlist3.m4s for example i get this error :

  video frame with PTS 0us has negative DTS -80000us after applying timestampOffset, handling any discontinuity, and filtering against append window.

  I want to be able to start from any chunk, currently the only way to play the video is to star by init.mp4 + playlist0.m4s meaning playlist0.m4s because init.mp4 contain just headers of the video, This is the client code i’m using :

  var socket = io();
  
  var video = document.querySelector('video');
  
  var mimeCodec = 'video/mp4; codecs="avc1.64000d,mp4a.40.2"'; // true
  
  if ('MediaSource' in window && MediaSource.isTypeSupported(mimeCodec)) 
  
  {
  
      var mediaSource = new MediaSource;
  
      video.src = URL.createObjectURL(mediaSource);
  
      mediaSource.addEventListener('sourceopen', function () {
  
              var mediaSource = this;
  
              var sourceBuffer = mediaSource.addSourceBuffer(mimeCodec);
  
             sourceBuffer.mode = 'segments'; 
  
              sourceBuffer.addEventListener('updateend', function (_) { video.play().then(function() { }).catch(function(error) { }); });
  
              socket.on('broadcast', function (chunk) {
  
                  downloadData(chunk.uri, function(arrayBuffer) {
  
                      sourceBuffer.appendBuffer(arrayBuffer);
  
                  });
  
              });
  
      });
  
  } else {
  
      console.error('Unsupported MIME type or codec: ', mimeCodec);
  
  }
  
  function downloadData(url, cb) {
  
      var xhr = new XMLHttpRequest;
  
      xhr.open('get', url);
  
      xhr.responseType = 'arraybuffer';
  
      xhr.onload = function () {
  
          cb(new Uint8Array(xhr.response));
  
      };
  
      xhr.send();
  
  }