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• Conversion from Iphone Core Surface RGB Frame into ffmepg AVFarme

  10 mars 2015, par Raghu

  I am trying to convert Core Surface RGB frame buffer(Iphone) to ffmpeg Avfarme to encode into a movie file. But I am not getting the correct video output (video showing colors dazzling not the correct picture)

  I guess there is something wrong with converting from core surface frame buffer into AVFrame.

  Here is my code :

  Surface *surface = [[Surface alloc]initWithCoreSurfaceBuffer:coreSurfaceBuffer];
  
  [surface lock];
  
  unsigned int height = surface.height;
  
  unsigned int width = surface.width;
  
  unsigned int alignmentedBytesPerRow = (width * 4);
  
  if (!readblePixels) {
  
      readblePixels = CGBitmapAllocateData(alignmentedBytesPerRow * height);
  
      NSLog(@"alloced readablepixels");
  
  }
  
  unsigned int bytesPerRow = surface.bytesPerRow;
  
  void *pixels = surface.baseAddress;
  
  for (unsigned int j = 0; j < height; j++) {
  
      memcpy(readblePixels + alignmentedBytesPerRow * j, pixels + bytesPerRow * j, bytesPerRow);
  
  }
  
  
  
  pFrameRGB->data[0] = readblePixels; // I guess here is what I am doing wrong.
  
  pFrameRGB->data[1] = NULL;
  
  pFrameRGB->data[2] = NULL;
  
  pFrameRGB->data[3] = NULL;
  
  
  
  pFrameRGB->linesize[0] = pCodecCtx->width;
  
  pFrameRGB->linesize[1] = 0;
  
  pFrameRGB->linesize[2] = 0;
  
  pFrameRGB->linesize[3] = 0;
  
  
  
  
  
  sws_scale (img_convert_ctx, pFrameRGB->data, pFrameRGB->linesize,
  
         0, pCodecCtx->height,
  
         pFrameYUV->data, pFrameYUV->linesize);   

  Please help me out.

  Thanks,

  Raghu

• FFMPEG Frame to DirectX Surface Hardware Accelerated

  20 novembre 2015, par M.Mahdipour

  I use ffmpeg functions to decode h264 frames and display in a window on windows platform. The approach which I use is as below (from FFMPEG Frame to DirectX Surface) :

  AVFrame *frame;
  
  avcodec_decode_video(_ffcontext, frame, etc...);
  
  
  
  lockYourSurface();
  
  uint8_t *buf = getPointerToYourSurfacePixels();
  
  
  
  // Create an AVPicture structure which contains a pointer to the RGB surface.
  
  AVPicture pict;
  
  
  
  memset(&pict, 0, sizeof(pict));
  
  
  
  avpicture_fill(&pict, buf, PIX_FMT_RGB32,
  
                 _ffcontext->width, _ffcontext->height);
  
  
  
  
  
  
  
  // Convert the image into RGB and copy to the surface.
  
  img_convert(&pict, PIX_FMT_RGB32, (AVPicture *)frame,
  
              _context->pix_fmt, _context->width, _context->height);
  
  
  
  
  
  unlockYourSurface();

  In the code, I use sws_scale instead of img_convert.

  When I pass the surface data pointer to sws_scale (in fact in avpicture_fill), it seems that the data pointer is actually on RAM not on GPU memory, and when I want to display the surface, it seems that the data is moved to GPU and then displayed. As I know CPU utilization is high when data is copied between RAM and GPU memory.

  How I can tel ffmpeg to render directly to a surface on GPU memory (not a data pointer on RAM) ?

• libavutil/opt.h : Fix duplicate words

  12 août 2013, par Michael Niedermayer

  libavutil/opt.h : Fix duplicate words
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavutil/opt.h