Video (Web cam) with quick response?

- C
- cadcoke4
  
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posted
16 years ago

Tue, Mar 11, 2008 1:24 PM

I've noticed that your typical web camshas a delay between the actual event and when you see it on screen. I am talking about 1/2 second of a delay. I am uncertain where the delay is happening, is it in the camera, the USB, or perhaps as my 1.2mhz computer works to display the video.

I know this is an issue for video conferencing, since it prevents you from having a truely fluid conversation over the internet (assuming that the internet is not causing any delays). I imagine it is also an issue for a telepresence robot as you attempt to steer it or control a robot arm.

I spoke with one company that deals with web conferencing and they say the systems without the delay have hardware compression in the camera, and cost around $3,000. Definitely out of my budget!

Are there any low-cost systems that don't have as much a delay?

I am not hotly persuing this issue, so don't go to any trouble researching this on my behalf.

Joe Dunfee

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- Gordon McComb
  
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posted
16 years ago

Wed, Mar 12, 2008 4:50 AM

Seems outrageous to me.

Check out Michael Owings' page at

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He might have specs on the video system he used.

From my own experience, I've had instant results when using a capture card. Not sure what's available today, but the cards I used were from outfits like Winnov, which also provided an SDK of sorts so that you could write programs to interface with the cards. They require a PCI slot, and have jacks for video (and audio, if they support on-board audio rather than relying on your PC's sound card). Several of the boards cost under $200, depending on features. Doesn't sound like you need a lot.

If you stay away from USB you don't need to deal with the company's proprietary driver to interface the camera. Or, if you can find a USB camera that has an open SDK then you might be able to write something yourself that lacks the delay, which is likely just in the preview window, and not the file writing stream. If you work in VB.NET or C# there's DirectShowLib. It is a wrapper to the Microsoft DirectShow platform. Complicated stuff, but they have some ready-to-go samples that will work with any camera that has a properly installed driver.

-- Gordon

- D
- dirskyster
  
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posted
16 years ago

Mon, Mar 17, 2008 5:00 AM

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