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• save ffmpeg AVFrame as dds file

  16 septembre 2017, par HamedBB

  Currently I can capture each frame of the video and save them as .bmp file on disk using following function (copied from an example) :

  bool BMPSave ( const char *pFileName, AVFrame * frame, int w, int h ) {
  
      bool bResult = false;
  
  
  
  
  
      if ( frame ) {
  
          FILE* file = fopen ( pFileName, "wb" );
  
  
  
          if ( file ) {
  
              // RGB image
  
              int imageSizeInBytes = 3 * w * h;
  
              int headersSize = sizeof( BITMAPFILEHEADER ) +sizeof( BITMAPINFOHEADER );
  
              int fileSize = headersSize + imageSizeInBytes;
  
  
  
              uint8_t * pData = new uint8_t[headersSize];
  
  
  
              if ( pData != NULL ) {
  
                  BITMAPFILEHEADER& bfHeader = *( ( BITMAPFILEHEADER * ) ( pData ) );
  
  
  
                  bfHeader.bfType = 'MB';
  
                  bfHeader.bfSize = fileSize;
  
                  bfHeader.bfOffBits = headersSize;
  
                  bfHeader.bfReserved1 = bfHeader.bfReserved2 = 0;
  
  
  
                  BITMAPINFOHEADER& bmiHeader = *( ( BITMAPINFOHEADER * ) ( pData + headersSize - sizeof( BITMAPINFOHEADER ) ) );
  
  
  
                  bmiHeader.biBitCount = 3 * 8;
  
                  bmiHeader.biWidth = w;
  
                  bmiHeader.biHeight = h;
  
                  bmiHeader.biPlanes = 1;
  
                  bmiHeader.biSize = sizeof( bmiHeader );
  
                  bmiHeader.biCompression = BI_RGB;
  
                  bmiHeader.biClrImportant = bmiHeader.biClrUsed =
  
                      bmiHeader.biSizeImage = bmiHeader.biXPelsPerMeter =
  
                      bmiHeader.biYPelsPerMeter = 0;
  
  
  
                  fwrite ( pData, headersSize, 1, file );
  
  
  
                  uint8_t *pBits = frame->data[0] + frame->linesize[0] * h - frame->linesize[0];
  
                  int nSpan = -frame->linesize[0];
  
  
  
                  int numberOfBytesToWrite = 3 * w;
  
  
  
                  for ( size_t i = 0; i < h; ++i, pBits += nSpan ) {
  
                      fwrite ( pBits, numberOfBytesToWrite, 1, file );
  
                  }
  
  
  
                  bResult = true;
  
                  delete[] pData;
  
              }
  
  
  
              fclose ( file );
  
          }
  
      }
  
  
  
      return bResult;
  
  }

  However I want to encode each of frame to dds format then use them with D3DX11CreateShaderResourceViewFromFile in direct3D but I can’t figure out how to convert my raw data to dds format.

• How to save an audiostream with ffmpeg

  13 juillet 2020, par Nico Eymael

  I want to save an audiostream from beatport.com with ffmpeg.

  


  

  1. The audiostream is : https://www.beatport.com/track/maximal-happiness/13855065

  


  2. Outputfile : audiotrack1.aac

  


  3. I know that the music is streamed in aac format. I want my output file to be also aac. I've looked up in which format it is being streamed.

  


  


  So in cmd I write :

  


  ffmpeg -i https://www.beatport.com/track/maximal-happiness/13855065.aac -vn -c:a copy audiotrack1.aac

  


  My cmd answers me :

  


  https://www.beatport.com/track/maximal-happiness/13855065: Invalid data found when processing input

  


  

  


• How to save stream with ffmpeg to chunks, But in temporary name and change the name after to const

  10 janvier, par Eliya

  I use ffmpeg to record IP camera and I save every 10 minutes to mp4 file.
This is my code :

  


  ffmpeg -rtsp_transport tcp -i "rtsp://$user_name:$password@$IP:$port/cam/realmonitor?channel=1&subtype=1" -c copy -map 0 -reset_timestamps 1  -f segment -segment_time 600 -strftime 1   "%Y-%m-%d__%H:%M:%S.mp4"


  


  Is there a way to save the file in temporary name until 10 minutes is done ?
I mean when the recording of 10 minutes didn't end the suffix will be bla.temp and when the recording of the 10 minutes is over, ffmpeg will change the suffix to .mp4 ?
is that possible ?