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• Revision 6a2e9ef20a : vpx_codec_decode : check data size When a valid data pointer is given make sure

  10 août 2014, par James Zern

  Changed Paths :
   Add /test/decode_api_test.cc

  
   Modify /test/test.mk

  
   Modify /vpx/src/vpx_decoder.c

  
  
  vpx_codec_decode : check data size

  When a valid data pointer is given make sure the size is greater than
  zero.
  A previous check for vp9 was incorrectly removed in :
  7050074 Make the api behavior conform to api spec.

  No semantics for valid pointers + 0-sized frames are defined for VPx
  codecs, so move the check to vpx_codec_decode(). This avoids an assert
  in vp9.

  + add some basic invalid param testing for decoder init/decode/destroy

  Change-Id : I99f9cef6076d15874fd72ac973f2685d8a2353c3

• 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