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Webcam capture (VFW)

Posted on 2006-05-08
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Last Modified: 2012-05-05
Hi,

I've created a remote webcam capture program using VFW (avicap32.dll) in VB6. On most cams and devices, it's able to capture correctly. Now there are some webcams that capture grayscale (non-color) images in my program, although they are able to capture color images (as is tested with other applications).

So here's my main question:
How can I set the capture driver to capture color images using VFW?

I've tried to use the WM_CAP_GET_VIDEOFORMAT and WM_CAP_SET_VIDEOFORMAT messages and changing the BITMAPINFO structure manually, but when changed, WM_CAP_SET_VIDEOFORMAT always returns false, which means the operation wasn't succesfull. I expect the problem to be the size and setting of the bmiColors array. Are there standardized API's for transforming this?

Now I've got secondary question of less importance:
How can I set the capture driver to return JPEG/PNG images instead of DIB/BMP images. I've tried it the same way as setting the color-scale by using WM_CAP_GET_VIDEOFORMAT and WM_CAP_SET_VIDEOFORMAT and changing the 'compression'-flag, but just like setting the color-scale, it always returns false.

One more thing: I don't want to do both things using the pop-up dialogs, everything should be in code.

Maybe these problems are all around memory handling. I prefer a VB solution, but since I couldn't even find a C/C++-solution which would point me in the right direction and I needed some help, even a C++-solution or general info would be very well appreciated.

Thanks in advance!
Nick
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Question by:ndjnl
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LVL 14

Accepted Solution

by:
MilanKM earned 2000 total points
ID: 16628867
See following link, may be what ur looking for...

http://www.pscode.com/vb/scripts/ShowCode.asp?txtCodeId=59068&lngWId=1

Thanks
MilanKM
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Author Comment

by:ndjnl
ID: 16632238
Thanks MilanKM, this solves the secondary problem. Points will be splitted when I'll close this question. However, my main problem, converting the color-scale, has not yet been solved. Can you or anyone else can help, or has some usefull info on how to set the grayscale to color?
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