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Hello Codeproject,

I am currently creating a screen recorder. And for this, I capture a screenshot every 40 miliseconds, I then scrape all the images together in an .avi. Screenshotting is not a problem, I currently use DirectX to do that:

Surface s;
public Surface CaptureScreen()
    s = Surface.CreateOffscreenPlain(d, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, SlimDX.Direct3D9.Format.A8R8G8B8, Pool.Scratch);
    d.GetFrontBufferData(0, s);
    return s;

Problem is that saving the file requires way more than 20 miliseconds, and I loop this void in a Timer Tick with the Interval of (1000 / FPS(25)).

void Tick_Tick(object sender, EventArgs e)
    // -- Stop if not recording.
    if (!Recording)
    // -- Save the screenshot.
    Surface.ToFile(CaptureScreen(), FolderPath + "image" + Directory.GetFiles(FolderPath).Length + ".jpg", ImageFileFormat.Jpg);

This is really, really, really slow. And I would love to know if anyone has any suggestions on how to increase the speed, or maybe not even saving the file. I don't know.
Posted 2-Feb-13 7:25am
Yvar Birx2.4K
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Solution 2

Why are you struggling with saving frames? File creation consumes more resources than keeping a file open and writing frames in it. Even less with a good codec. Make the video directly. Try these for example:[^][^]
Yvar Birx 2-Feb-13 12:49pm
Cheers mate, shame I didn't thought of that. ;3
Edo Tzumer 3-Feb-13 1:21am
Of course!
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Solution 3

This is a horrible way to do this. You can't create and write MB's of data to files every 20 milliseconds. You'll just completely flood the HD channel.

Get a VNC or Video Capture library to do this. They will do a FAR more efficient job than you're going to "homebrew".

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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