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• 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;

• 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！ :(

  


• concat 2 mini audio files and make a loop and add a background music

  11 octobre 2020, par Johny Sharma

  I Need to concatenate 2 small audio files with loop and add background music in a single command.

  



  I am capable to concatenate two audio files with a background music. My above given code is working.

  



  ffmpeg -i 1.mp3 -i 2.mp3 -i background.mp3 
-filter_complex "[0:0][1:0]concat=n=2:v=0:a=1,volume=1dB,aformat=fltp, pan=stereo|c0=c0|c1=c0[a0]; 
[2]volume=0.5dB,aformat=fltp,pan=stereo|c0=c0|c1=c1[a1];[a0][a1]amix=inputs=2:duration=longest,aformat=fltp[a]"
-map "[a]" -strict -2 -y output.mp3


  



  but i want to a make a loop of the concatenated files till the end of the background music. background music is longer than approx 5 times from concatenated files.

  



  If someone can suggest a single command solution.

  



  I know about amovie tag but unfortunately its not possible to use in here because amovie requires file name which is not possible with concatenated files as per my knowledge.

  



  Can anyone help me how can i achieve my goal !

  



  Thanks