Question

I was wondering how do software like GotoMeeting capture desktop. I can do a full screen (or block by block) capture using GDI but that just seems too wasteful to me. Also I have looked into Mirror devices but I was wondering if there s a simpler technique or a library out there which does this.

I need fast and efficient desktop screen capture (10p15 fps) which I am eventually going to convert into a video file and integrate with my application to send the captured feed over the network or something.

Thanks!

Answer 1

Yes, taking a screen capture and finding the diff between previous capture would be a good way to reduce bandwidth on transmission by sending the changes across only, of course this is similar to video encoding techniques which does this block by block.

Still means you need to do a capture plus extra processing for getting the difference, i.e, encoding it.

Answer 2

by using the Mirror devices you can get both the updated Rectangle that are change and also pointer to the Screen. updated Rectangle pointer point to all the rectangle that are change , these rectangle are the change rectangle that are frequently changing. filter out some of the rectangle because in one second you can get 1000 of rectangles.

Answer 3

I would either:

Do full screen captures, and then perform image processing to isolate parts of the screen that have changed to save bandwidth.

-OR-

Use a program like CamStudio.

Answer 4

i got 20 to 30 frame per second using memory driver i am display on my picture box but when i get full screen update then these frame are buffered. as picture box is slow and have change to my own component this is some how fast but not good on full screen as well averge i display 10 fps in full screen. i am facing problem in rendering frames i can capture 20 to 30 frames per second but my rendering is 8 to 10 full screen frames in one second . if any one has achive rendering frames in full screen please replay me.

Answer 5

What language?

.NET provides Graphics.CopyFromScreen.

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