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• Can't list_options for capture card in ffmpeg : "Unable to BindToObject"

  11 novembre 2023, par Tibor BERNARD

  I'm trying to list the options of a "AJA Kona3G Quad" device on Windows 10 using ffmpeg.

  


  


  [dshow @ 000001343e7d9740] DirectShow video devices (some may be both
video and audio devices) [dshow @ 000001343e7d9740] "AJA S-Capture
Kona3GQuad - 0"

  


  [dshow @ 000001343e7d9740] Alternative name
"@device_sw_860BB310-5D01-11D0-BD3B-00A0C911CE8689BB1170-565C-49B6-9DED-D6D2DFCA06A8"

  


  [dshow @ 000001343e7d9740] DirectShow audio

  


  [dshow @ 000001343e7d9740] "AJA S-Capture [Audio] Kona3GQuad - 0"

  


  [dshow @ 000001343e7d9740] Alternative name
"@device_sw_33D9A762-90C8-11D0-BD43-00A0C911CE8689BB1190-565C-49B6-9DED-D6D2DFCA06A8"

  


  


  Listing the devices seemsok, but once I get my device name and try to list it's options ffmpeg returns the following

  


  


  [dshow @ 000001aeac2a96c0] Unable to BindToObject for AJA S-Capture Kona3GQuad - 0

  


  [dshow @ 000001aeac2a96c0] Could not find video device with name [AJA
S-Capture Kona3GQuad - 0] among source devices of type video.

  


  video=AJA S-Capture Kona3GQuad - 0 : I/O error

  


  


  Have any of you already encountered this issue, and if so could you point me in the right direction

  


• ffmpeg memory usage, or memory leaks

  26 janvier, par happycoding-boy

  I'v write a simple program to get audio waveform data, which using ffmpeg version 6.1. And program works fine. But I get a problem : when program running at begin, system report using about 6MB memory, but when I call the function and cleanup the resouce alloced, system report about 9MB memory used. In my theory, after cleanup, it should be 6MB again. [I'm sure, I freed the AVPacket when read stream, and AVFrame for decoding.] My question is : Is this normal or not ?

  


  int main(int argc, char *argv[])
{
    // breakpoint here: ~= 6MB
    get_audio_waveform();
    // breakpoint here: ~= 9MB
}


  


  The ffmpeg struct I used :

  


  AVFormatContext*    p_input_fmt_ctx = nullptr;
AVCodecContext*     p_input_cdc_ctx = nullptr;
SwrContext*         p_resampler_ctx = nullptr;
AVAudioFifo*        p_audio_fifo    = nullptr;
uint8_t**           p_converted_input = nullptr;
uint8_t**           p_converted_output = nullptr;


  


  The cleanup func :

  


  void _cleanup()
{
    avformat_close_input(&p_input_fmt_ctx);
    avcodec_free_context(&p_input_cdc_ctx);
    swr_free(&p_resampler_ctx);
    
    if (p_audio_fifo)
    {
        av_audio_fifo_reset(p_audio_fifo);
        av_audio_fifo_free(p_audio_fifo);
        p_audio_fifo = nullptr;
    }
    
    if (p_converted_input)
    {
        av_freep(&p_converted_input[0]);
        free(p_converted_input);
        p_converted_input = nullptr;
    }
    
    if (p_converted_output)
    {
        av_freep(&p_converted_output[0]);
        free(p_converted_output);
        p_converted_output = nullptr;
    }
}


  


  In my opinion，If this function have about 3MB memory leaks6MB. when I run this function 5-times, it should be about 15MB memory leaks.6MB. But when I run this function 5-times. After that, system just reports about 10-11 memory used. I doubt wheather program uses runtime library (i.e. libc or equivalent) and the library allocates some memory for own needs？ I do not known which step is wrong！ :(

  


• avcodec_encode_video memory leaks

  13 juillet 2012, par user1522503

  I got some ffmpeg memory problems.
  I think they happen to avcodec_encode_video() ;

  When I used it to encode less than 6 YUV420 files(the size is different, 704x576 1600x1200 540x480),the memory was normal, but if more than 6, the system memories increased 100M/S, the program will crash soon.

  please advice, thanks.

  iOutSie = 0;
  
      ptPicture = (AVFrame *)malloc(sizeof(AVFrame));
  
  
  
      if (!ptPicture)
  
      {
  
          gbiLastErrorNumber = NPC_D_SMP_CODEC_ERROR_MALLOC_ERR;
  
          goto _NPC_CLEAR;
  
      }
  
  
  
      pYuvBuff = (NPC_BYTE *)malloc(1024*1024*8);
  
  
  
   if (!pYuvBuff) 
  
    {
  
  
  
          goto _NPC_CLEAR;
  
  
  
      }
  
  
  
      avpicture_fill((AVPicture*)ptPicture, pYuvBuff, PIX_FMT_YUV420P, hEncode->tEncodeVideoParam.iWidth,
  
          hEncode->tEncodeVideoParam.iHeight);    
  
  
  
  
  
          scxt = sws_getContext(
  
              in_pOriBPS->iWith, //source width
  
              in_pOriBPS->iHeight, //source height
  
              PIX_FMT_YUV420P,    //source pix format
  
              hEncode->tEncodeVideoParam.iWidth, //destination width, height, and pix format
  
              hEncode->tEncodeVideoParam.iHeight, 
  
              PIX_FMT_YUV420P,
  
              SWS_SINC, 
  
              NULL,NULL,NULL
  
          );
  
  
  
  
  
  
  
      if(!scxt)
  
      {
  
          gbiLastErrorNumber = NPC_D_SMP_CODEC_ERROR_sws_getContext_ERR;
  
          goto _NPC_CLEAR;
  
      }
  
  
  
      sws_scale(
  
          scxt,
  
          hEncode->picture->data, hEncode->picture->linesize, 
  
          0, in_pOriBPS->iHeight, 
  
          ptPicture->data, ptPicture->linesize);
  
  
  
      if (in_pDestDataBufSize < (hEncode->tEncodeVideoParam.iWidth * hEncode->tEncodeVideoParam.iHeight * 3 / 2) )
  
      {
  
          gbiLastErrorNumber = NPC_D_SMP_CODEC_ERROR_PARAM_ERR;
  
          goto _NPC_CLEAR;
  
      }
  
  
  
      iOutSize = avcodec_encode_video(hEncode->c, out_pDestDataBuf, in_pDestDataBufSize, ptPicture);  
  
  
  
  _NPC_CLEAR:
  
  if(pYuvBuff) free(pYuvBuff);
  
  return iOutSize;