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• keyframe frequency of four seconds or less error when trying to stream a VOD file to ant media server

  24 janvier 2023, par Usama

  I am trying to stream a VOD file to Youtube using ant media server. I have uploaded the file to AMS and added the RTMP url but after starting the broadcast I am getting an error from YouTube saying "Please use a keyframe frequency of four seconds or less. Currently, keyframes are not being sent often enough, which can cause buffering. The current keyframe frequency is 6.8 seconds. Note that ingestion errors can cause incorrect GOP (group of pictures) sizes."
How do I configure the keyframe frequency for my file

  


• avcodec/cbs_h266 : Fix regression in DVB clip introduced by 93281630a71c06642adfebebb0...

  10 novembre 2024, par Nuo Mi

  avcodec/cbs_h266 : Fix regression in DVB clip introduced by 93281630a71c06642adfebebb0d4b105a4e02e91
  This commit introduced a regression to VVC_HDR_UHDTV1_OpenGOP_3840x2160_50fps_HLG10_mosaic.ts.
  Root Cause :
  
  The AV_CEIL_RSHIFT(a, b) macro uses bit tricks that work only when -a is a negative value.
  
  However, due to integer promotion rules, this behavior does not extend to the unsigned int type.
  See "6.3.1.1 Boolean, characters, and integers" in the "ISO/IEC 9899" for details.
  Reported-by : Frank Plowman <post@frankplowman.com>
  

  • [DH] libavcodec/cbs_h266_syntax_template.c

• Blurry picture when decoding h264 mpegts udp stream with ffmpeg

  10 juin 2019, par Fredrik Axling

  Im using ffmpeg do read an udp stream (contains only video) and to decode frames , I then like to encode again , but during the decoding or from the demuxing i get blurry pictures pictures especially the lower part.

  I have a video player that also uses ffmpeg that displays the video perfectly and I try to look in that code but I don’t see any differences.
  In the log I se things like
  

  Invalid NAL unit 8, skipping.
  nal_unit_type : 1(Coded slice of a non-IDR picture), nal_ref_idc : 3
  
  Invalid NAL unit 7, skipping.
  
  bytestream overread td
  
  error while decoding MB 109 49, bytestream td
  

  The main things in the code looks like :

  av_register_all();
  
  
  
  AVFormatContext *fmt_ctx = 0;
  
  
  
  AVDictionary *options = 0;
  
  av_dict_set(&options, "analyzeduration", "500000", NULL);
  
  av_dict_set(&options, "probesize", "500000", NULL);
  
  char* url = "udp://239.0.0.3:8081";
  
  avformat_open_input(&fmt_ctx, url, 0, &options);
  
  
  
  avformat_find_stream_info(fmt_ctx, &options);
  
  
  
  int nRet = 0;
  
  av_dump_format(fmt_ctx, 0, url, 0);
  
  AVStream *pStream = fmt_ctx->streams[0];
  
  AVCodecID nCodecid = pStream->codec->codec_id;
  
  AVCodec* pCodec = avcodec_find_decoder(nCodecid);
  
  AVCodecContext* pCodecCtx = pStream->codec;
  
  
  
  nRet = avcodec_open2(pCodecCtx, pCodec, NULL);
  
  int nInH = pStream->codec->height;
  
  int nInW = pStream->codec->width;
  
  int nOutW = nInW / 4;
  
  int nOutH = nInH / 4;
  
  
  
  SwsContext* pSwsCtx = sws_getContext(nInW, nInH, AV_PIX_FMT_YUV420P,
  
                                       nOutW, nOutH, AV_PIX_FMT_RGB24,
  
                                       SWS_BICUBIC, NULL, NULL, NULL);
  
  
  
  
  
  m_pFilmWdg->m_img = QImage(nOutW, nOutH, QImage::Format_RGB888);
  
  int linesizes[4];
  
  av_image_fill_linesizes(linesizes, AV_PIX_FMT_RGB24, nOutW);
  
  
  
  
  
  for (;;)
  
  {
  
      av_init_packet(&pkt);
  
      pkt.data = NULL;
  
      pkt.size = 0;
  
      nRet = av_read_frame(fmt_ctx, &pkt);
  
  
  
      nRet = avcodec_send_packet(pCodecCtx, &pkt);
  
  
  
      AVFrame*  picture = av_frame_alloc();
  
  
  
      nRet = avcodec_receive_frame(pCodecCtx, picture);
  
  
  
      if (AVERROR(EAGAIN) == nRet)
  
          continue;
  
  
  
      uint8_t* p[] = { m_pFilmWdg->m_img.bits() };
  
  
  
  
  
  
  
      nRet = sws_scale(pSwsCtx, picture->data, picture->linesize, 0, nInH, p, linesizes);
  
  
  
      av_packet_unref(&pkt);
  
      av_frame_free(&picture);
  
      m_pFilmWdg->update();
  
  
  
  }