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

hi,

It is only an example, it is not complete. mpeg can have many internal
format, are you sure you use the right conversion?

Patches welcome to fix the examples :)

Cheers,

On Sun, May 31, 2009 at 12:32 PM, Udo Pokojski <[email protected]> wrote:
> 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
>>
>
>



-- 
Pierre

http://blog.thepimp.net | http://www.libgd.org