How to get frame delay from animated gif?

问题

I try resize animated gif. I resize each frame as bitmap and then make new animated gif but I don't know how to get frame delay for same speed animation as in original gif.

uses Gifimg;

procedure TForm1.FormCreate(Sender: TObject);
var
  gif: TGIFImage;
  bmp,bmp2: TBitmap;
  i:integer;
  gifren: TGIFRenderer;
  gif2:TGifImage;
begin
  gif:=TGIFImage.Create;
  gif2:=tgifimage.Create;
  bmp:=TBitmap.Create;
  bmp2:=TBitmap.Create;
    gif.LoadFromFile('d:\z.gif');
    gifren:=TGIFRenderer.Create(gif);
      for i:=0 to gif.Images.Count-1 do begin
      bmp.SetSize(gif.Width, gif.Height);
      gifren.Draw(bmp.Canvas, bmp.Canvas.ClipRect);
       bmp2.SetSize(1111,1111);
        bmp2.Canvas.StretchDraw(Rect(0, 0, 1111, 1111), bmp);

        TGIFGraphicControlExtension.Create(gif2.add(bmp2)).Delay:=10;
        gifren.NextFrame;
      end;
   TGIFAppExtNSLoop.Create(Gif2.Images.Frames[0]).Loops:=0;
   Gif2.SaveToFile('d:\gif.gif');
 end;

回答1:

Refer to help Vcl.Imaging.GIFImg.TGIFRenderer.FrameDelay

Specifies the delay time before moving to the next frame in an animated GIF.

But do consider that the resized image may require more time to render, and it may not be possible to keep up the pace.

来源：https://stackoverflow.com/questions/35521931/how-to-get-frame-delay-from-animated-gif