Re: [GD-DEVEL] Problems converting AVFrame to gdImagePtr

Hi,

Yes, I am using ffmpeg and I started with the example from cvs.
Meanwhile I have written a function whichs saves the Image as a PPM-File
without using libgd-Functions. This function looks like this:

---------------------------------------------------------------------
void SaveFrame_ppm(AVFrame *pFrame, int width, int height, int iFrame) {
  FILE *pFile;
  char szFilename[32];
  int  y;
  
  // Open file
  sprintf(szFilename, "frame%d.ppm", iFrame);
  pFile=fopen(szFilename, "wb");
  if(pFile==NULL)
    return;
  
  // Write header
  fprintf(pFile, "P6\n%d %d\n255\n", width, height);
  
  // Write pixel data
  for(y=0; y<height; y++)
    fwrite(pFrame->data[0]+y*pFrame->linesize[0], 1, width*3, pFile);
  
  // Close file
  fclose(pFile);
}

----------------------------------------------------------------------

Since the pictures are corrupted when I use libgd-Functions, there must
be an error in the example code.



Am Samstag, den 30.05.2009, 19:39 +0200 schrieb Pierre Joye:
> Hi,
> 
> Do you use ffmpeg? There is an example in cvs:
> 
> http://cvs.php.net/viewvc.cgi/gd/playground/ffmpeg/
> 
> Cheers,
> 
> On Sat, May 30, 2009 at 4:44 PM, Udo Pokojski <[email protected]> wrote:
> > Hi,
> >
> > I am trying to extract single frame from a MP2-File. The frames are
> > extracted and saved as AVFrame. For further processing I want to convert
> > the AVFrame to an gdImagePtr. The conversion should be done by this
> > code:
> > -------------------------------------------------------------------------
> > void SaveFrame_png(AVFrame *pFrame, int width, int height, int iFrame) {
> >  FILE *pFile;
> >  char szFilename[32];
> >  int  x,y;
> >  gdImagePtr im;
> >  int *src;
> >
> >  im=gdImageCreateTrueColor(width, height);
> >    //gdImageInterlace(im, 1);
> >  src = (int *) pFrame->data[0];
> >  for(y=0; y < height; y++) {
> >    for (x=0; x < width; x++) {
> >       gdImageSetPixel(im, x, y, src[x] & 0x00FFFFFF);
> >       //   im->tpixels[y][x] = src[x] & 0x00FFFFFF;
> >        }
> >        src += width;
> >  }
> >
> >  sprintf(szFilename, "frame%d.png", iFrame);
> >  pFile=fopen(szFilename, "wb");
> >  if(pFile==NULL)
> >    return;
> >  gdImageInterlace(im,1);
> >  gdImagePng(im,pFile);
> >
> >  fclose(pFile);
> >
> > }
> >
> > ------------------------------------------------------------------------------
> >
> > For a quick test, I save the gdImagePtr as a PNG-File.
> > The resulting file shows a kind of interlace and a multiple horizontal
> > shift. I have uploaded an example to
> > http://www.freeimagehosting.net/uploads/081ff0fcb2.png
> >
> > Write a JPG-File gives the same result.
> > Where is the error in this code?
> >
> > Thx,
> > Udo
> >
> >
> >
> >
> > --
> > GD Devel Mailing List (http://www.php.net/)
> > To unsubscribe, visit: http://www.php.net/unsub.php
> >
> >
> 
> 
> 
> -- 
> Pierre
> 
> http://blog.thepimp.net | http://www.libgd.org
>