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• Updated version number.

  8 avril 2013, par blueimp

  m server/php/UploadHandler.php
  

  Updated version number.

• Segfault while trying to fill the yuv image for rtsp streaming

  21 septembre 2016, par tankyx

  I am capturing the video stream from a window, and I want to restream it to my rtsp proxy server. However, it seems I can’t write the frame properly, but I can show the said frame in a SDL window. Here is my code :

  int StreamHandler::storeStreamData()
  
  {
  
  // Allocate video frame
  
  pFrame = av_frame_alloc();
  
  
  
  // Allocate an AVFrame structure
  
  pFrameRGB = av_frame_alloc();
  
  if (pFrameRGB == NULL)
  
      throw myExceptions("Error : Can't alloc the frame.");
  
  
  
  // Determine required buffer size and allocate buffer
  
  numBytes = avpicture_get_size(AV_PIX_FMT_YUV420P, pCodecCtx->width,
  
      pCodecCtx->height);
  
  buffer = (uint8_t *)av_malloc(numBytes * sizeof(uint8_t));
  
  
  
  // Assign appropriate parts of buffer to image planes in pFrameRGB
  
  avpicture_fill((AVPicture *)pFrameRGB, buffer, AV_PIX_FMT_YUV420P,
  
      pCodecCtx->width, pCodecCtx->height);
  
  
  
  //InitSdlDrawBack();
  
  
  
  // initialize SWS context for software scaling
  
  
  
  sws_ctx = sws_getContext(pCodecCtx->width,
  
      pCodecCtx->height,
  
      pCodecCtx->pix_fmt,
  
      pCodecCtx->width,
  
      pCodecCtx->height,
  
      pCodecCtx->pix_fmt,
  
      SWS_LANCZOS,
  
      NULL,
  
      NULL,
  
      NULL
  
  );
  
  
  
  SetPixelArray();
  
  FfmpegEncoder enc("rtsp://127.0.0.1:1935/live/myStream");
  
  
  
  i = 0;
  
  while (av_read_frame(pFormatCtx, &packet) >= 0) {
  
      if (packet.stream_index == videoindex) {
  
          // Decode video frame
  
          avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
  
          if (frameFinished) {
  
              i++;
  
              //DrawFrame();
  
  
  
              sws_scale(sws_ctx, (uint8_t const * const *)pFrame->data,
  
                  pFrame->linesize, 0, pCodecCtx->height,
  
                  pFrameRGB->data, pFrameRGB->linesize);
  
              enc.encodeFrame(pFrameRGB, i);
  
          }
  
      }
  
      // Free the packet that was allocated by av_read_frame
  
      av_free_packet(&packet);
  
  }
  
  // Free the RGB image
  
  av_free(buffer);
  
  av_frame_free(&pFrameRGB);
  
  
  
  // Free the YUV frame
  
  av_frame_free(&pFrame);
  
  
  
  // Close the codecs
  
  avcodec_close(pCodecCtx);
  
  avcodec_close(pCodecCtxOrig);
  
  
  
  // Close the video file
  
  avformat_close_input(&pFormatCtx);
  
  
  
  return 0;
  
  }
  
  
  
  void StreamHandler::SetPixelArray()
  
  {
  
  yPlaneSz = pCodecCtx->width * pCodecCtx->height;
  
  uvPlaneSz = pCodecCtx->width * pCodecCtx->height / 4;
  
  yPlane = (Uint8*)malloc(yPlaneSz);
  
  uPlane = (Uint8*)malloc(uvPlaneSz);
  
  vPlane = (Uint8*)malloc(uvPlaneSz);
  
  if (!yPlane || !uPlane || !vPlane)
  
      throw myExceptions("Error : Can't create pixel array.");
  
  
  
  uvPitch = pCodecCtx->width / 2;
  
  }

  Here I fill the YUV image and write the packet.

  void FfmpegEncoder::encodeFrame(AVFrame * frame, int frameCount)
  
  {
  
  AVPacket    pkt = { 0 };
  
  int         got_pkt;
  
  
  
  av_init_packet(&pkt);
  
  frame->pts = frameCount;
  
  
  
  FillYuvImage(frame, frameCount, this->pCodecCtx->width, this->pCodecCtx->height);
  
  
  
  if (avcodec_encode_video2(this->pCodecCtx, &pkt, frame, &got_pkt) < 0)
  
      throw myExceptions("Error: failed to encode the frame. FfmpegEncoder.cpp l:61\n");
  
  
  
  //if the frame is well encoded
  
  if (got_pkt) {
  
      pkt.stream_index = this->st->index;
  
      pkt.pts = av_rescale_q_rnd(pkt.pts, this->pCodecCtx->time_base, this->st->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
  
      if (av_write_frame(this->outFormatCtx, &pkt) < 0)
  
          throw myExceptions("Error: failed to write video frame. FfmpegEncoder.cpp l:68\n");
  
  }
  
  }
  
  
  
  void FfmpegEncoder::FillYuvImage(AVFrame * pict, int frame_index, int width, int height)
  
  {
  
  int x, y, i;
  
  
  
  i = frame_index;
  
  
  
  for (y = 0; y < height; y++)
  
  {
  
      for (x = 0; x < width / 2; x++)
  
          pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
  
  }
  
  for (y = 0; y < height; y++)
  
  {
  
      for (x = 0; x < width / 2; x++)
  
      {
  
          pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
  
          pict->data[2][y * pict->linesize[2] + x] = 64 + y + i * 5; //segault here
  
      }
  
  }
  
  }

  The "FillYuvImage" method is copied from a FFMPEG example, but It does not work for me. If I don’t call it, the "av_write_frame" function won’t work (segfault too).

  EDIT : Here is my output context and codec initialization.

  FfmpegEncoder::FfmpegEncoder(char *url)
  
  {
  
  AVRational      tmp_time_base;
  
  AVDictionary*   options = NULL;
  
  
  
  this->pCodec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
  if (this->pCodec == NULL)
  
      throw myExceptions("Error: Can't initialize the encoder. FfmpegEncoder.cpp l:9\n");
  
  
  
  this->pCodecCtx = avcodec_alloc_context3(this->pCodec);
  
  
  
  //Alloc output context
  
  if (avformat_alloc_output_context2(&outFormatCtx, NULL, "rtsp", url) < 0)
  
      throw myExceptions("Error: Can't alloc stream output. FfmpegEncoder.cpp l:17\n");
  
  
  
  this->st = avformat_new_stream(this->outFormatCtx, this->pCodec);
  
  
  
  if (this->st == NULL)
  
      throw myExceptions("Error: Can't create stream . FfmpegEncoder.cpp l:22\n");
  
  
  
  av_dict_set(&options, "vprofile", "main", 0);
  
  av_dict_set(&options, "tune", "zerolatency", 0);
  
  
  
  tmp_time_base.num = 1;
  
  tmp_time_base.den = 60;
  
  
  
  //TODO : parse these values
  
  this->pCodecCtx->bit_rate = 3000000;
  
  this->pCodecCtx->width = 1280;
  
  this->pCodecCtx->height = 720;
  
  //This set the fps. 60fps at this point.
  
  this->pCodecCtx->time_base = tmp_time_base;
  
  //Add a intra frame every 12 frames
  
  this->pCodecCtx->gop_size = 12;
  
  this->pCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
  
  
  
  //Open Codec, using the context + x264 options
  
  if (avcodec_open2(this->pCodecCtx, this->pCodec, &options) < 0)
  
      throw myExceptions("Error: Can't open the codec. FfmpegEncoder.cpp l:43\n");
  
  
  
  if (avcodec_copy_context(this->st->codec, this->pCodecCtx) != 0) {
  
      throw myExceptions("Error : Can't copy codec context. FfmpegEncoder.cpp : l.46");
  
  }
  
  
  
  av_dump_format(this->outFormatCtx, 0, url, 1);
  
  
  
  if (avformat_write_header(this->outFormatCtx, NULL) != 0)
  
      throw myExceptions("Error: failed to connect to RTSP server. FfmpegEncoder.cpp l:48\n");
  
  }

• avfilter/vf_libplacebo : don't force dovi frames to bt.2020-ncl

  30 octobre 2023, par Niklas Haas

  avfilter/vf_libplacebo : don't force dovi frames to bt.2020-ncl
  This is at odds with the YUV matrix negotiation API, in which such
  
  dynamic changes in YUV encoding are no longer easily possible. There is
  
  also no really strong motivating reason to do this, since the choice of
  
  YUV matrix is essentially arbitrary and not actually related to the
  
  Dolby Vision decoding process.
  

  • [DH] libavfilter/vf_libplacebo.c