Recherche avancée

Sur d’autres sites (8787)

• (FFMPEG Error)Real-time buffer [USB cam's name] too full or near too full

  9 juin 2020, par ZzangWoo

  I am doing project about making rtsp stream of my USB Camera.
And my project environment is 
- OS : windows server 2019
- CPU : AMD Ryzen 7 3700X
- RAM : 64GB
- GPU : NVIDIA GeForce RTX 2070 SUPER

  



  My project goal is to detect object with YOLO and show original cam video, detected video to client. So I need to change my USB Camera to RTSP Stream. But I had an error below picture.
enter image description here

  



  And this is my command line.

  



  ffmpeg -re -f dshow -i video="JOYTRON HD20" -pix_fmt yuv420p -vsync 1 -threads 0 -vcodec libx264 -r 30 -g 60 -sc_threshold 0 -b:v 640k -bufsize 768k -maxrate 800k -preset veryfast -profile:v baseline -tune film -acodec aac -b:a 128k -ac 2 -ar 48000 -f rtsp rtsp ://localhost:8888/test

  



  I saw an answer that the problem is bandwidth. So I added parameter. It didnt help.

  



  I also added the -rtbufsize parameter and -thread_queue_size parameter. But it didnt help anything.

  



  What should I do ??

  


• Memory leak when using av_frame_get_buffer()

  19 juillet 2018, par Alec Matthews

  I am making a simple video player with ffmpeg. I have noticed that there is a memory leak originating in libavutil. Because ffmpeg is a mature library I assume that I am allocating a new frame incorrectly. The documentation is also vague about freeing the buffer that is created when you call av_frame_get_buffer(). Below is the code I am using to decode the video and queue it up for display on the UI thread.

  DWORD WINAPI DecoderThread(LPVOID lpParam)
  
  {
  
      AVFrame *frame = NULL;
  
      AVPacket pkt;
  
  
  
      SwsContext *swsCtx = NULL;
  
      UINT8 *buffer = NULL;
  
      INT iNumBytes = 0;
  
  
  
      INT result = 0;
  
  
  
      frame = av_frame_alloc();
  
  
  
      av_init_packet(&pkt);
  
      pkt.data = NULL;
  
      pkt.size = 0;
  
  
  
      // Create scaling context
  
      swsCtx = sws_getContext(codecCtx->width, codecCtx->height, codecCtx->pix_fmt, codecCtx->width, codecCtx->height, AV_PIX_FMT_BGR24, SWS_BICUBIC, NULL, NULL, NULL);
  
  
  
     while (av_read_frame(fmtCtx, &pkt) >= 0) {
  
          if (pkt.stream_index == videoStream) {
  
              result = avcodec_send_packet(codecCtx, &pkt);
  
  
  
              while (result >= 0) {
  
                  result = avcodec_receive_frame(codecCtx, frame);
  
                  if (result == AVERROR(EAGAIN) || result == AVERROR_EOF) {
  
                      break;
  
                  } else if (result < 0) {
  
                      // another error.
  
                  }
  
                  // Create a new frame to store the RGB24 data.
  
                  AVFrame *pFrameRGB = av_frame_alloc();
  
                  // Allocate space for the new RGB image.
  
                  //av_image_alloc(pFrameRGB->data, pFrameRGB->linesize, codecCtx->width, codecCtx->height, AV_PIX_FMT_BGR24, 1);
  
                  // Copy all of the properties from the YUV420P frame.
  
                  av_frame_copy_props(pFrameRGB, frame);
  
                  pFrameRGB->width = frame->width;
  
                  pFrameRGB->height = frame->height;
  
                  pFrameRGB->format = AV_PIX_FMT_BGR24;
  
                  av_frame_get_buffer(pFrameRGB, 0);
  
  
  
                  // Convert fram from YUV420P to BGR24 for display.
  
                  sws_scale(swsCtx, (const UINT8* const *) frame->data, frame->linesize, 0, codecCtx->height, pFrameRGB->data, pFrameRGB->linesize);
  
  
  
                  // Queue thr BGR frame for drawing by the main thread.
  
                  AddItemToFrameQueue(pFrameRGB);
  
  
  
                  av_frame_unref(frame);
  
              }
  
          }
  
         while (GetQueueSize() > 100) {
  
              Sleep(10);
  
         }
  
     }
  
  
  
      CloseFrameQueue();
  
  
  
      av_frame_free(&frame);
  
     avcodec_close(codecCtx);
  
     avformat_close_input(&fmtCtx);
  
  
  
      return 0;
  
  }

  Is there a better way to allocate a new frame for holding the post sws_scale() transformation ?

  There is a similar stackoverflow question that uses mostly depreciated function calls. I can’t seem to find any answers that conform to the new version of ffmpeg in the documentation. Any help would be appreciated.

• avformat/segafilmenc : Postpone check for existence of video stream

  14 janvier 2020, par Andreas Rheinhardt

  avformat/segafilmenc : Postpone check for existence of video stream
  Up until now, the Sega FILM muxer complained if the first stream wasn't a
  
  video stream that there is no video stream at all which is of course
  
  nonsense. So postpone this check.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/segafilmenc.c