Fastest way to capture screen

I need a fastest way to capture a screen.

The scenario:
- I play an AVI file in screen position 0,0
- within 1 second, I will try to capture as much as possible in that screen position with size = 320x240
- Each captured image will be saved as JPG.

Currently, I am using Bitblt like this :

   DC := getDC(GetDesktopWindow);
   
   jpg.CompressionQuality := 60;
   done := FALSE;

   Timer1.Interval := 1000;
   Timer1.Enabled := TRUE;
   while not done do
   begin
      BitBlt(bmp.Canvas.Handle, 0, 0, 320, 240, DC, 0, 0, SRCOPY);
      jpg.Assign(bmp);
      jpg.SaveToFile('capture'+IntToStr(ctr)+'.jpg');
      Inc(ctr);
      Application.ProcessMessage;
   end;

   ReleaseDC(DC, DC);

Using Pentium 4 2.0 GHz, I can capture about 53 files.

But I need to optimize this code. Is it possible?

kapotAsked:
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GloomyFriarCommented:
I'm not shure, but I think that using DirectX will be faster.
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gmayoCommented:
Using JPG will slow it down (compression algorithms take time). Using BMP will use up more disk space and may take longer to write to disk. Try a different format (BMP, GIF, etc) and see whether it is any quicker.

Geoff M.
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LeVuHoangCommented:
does anybody know a sample to copy screen using DirectX by Delphi ???
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ZolikaPCommented:
try to capture not the hole screen, just the range that is usefull for you...
put all pictures in a stream in your own format, and make pictures after you've finished the capture.

regards,
  Zoltan.
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ZolikaPCommented:
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LeVuHoangCommented:
anybody can give me a delphi sample to capture screen using DirectX ?
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