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• Android - Save image and video to mp4 [duplicate]

  8 avril 2017, par Brooks

  This question is an exact duplicate of :

  • Saving SurfaceView with canvas on top

  I have a surfaceview which my video is played on, I also draw shapes on top of that view/canvas. I want to save/export the canvas and mediaplayer as one mp4 file.

  According to this FFMPEG works I will be able to create a mp4 file from images. But in my case I draw to canvas, I can save the canvas as jpg, but I still sit with the problem of how to export/save mp4 and jpg together as one mp4 file.

  This link say that I can get the coordinates the image and ’merge’ image and mp4 together with ffmpeg.

  I have been struggling with this for some time, can anyone please point me in the right direction ?

  Thank you in advance.

• how to generate video thumbnail in node.js and save it as a buffer ?

  4 septembre 2021, par Jourdelune

  I want to get the thumbnails of a video at half of it but I should not save the image in a file but get the buffer. I tested ffmepg
ffmpeg -ss 146 -i video.mp4 -y -an -t 4 source
but it does not propose to recover the buffer. Do you know a solution ?

  


• 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.