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Thread: WDM Video Capturing

  1. #1

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    Unhappy WDM Video Capturing

    Hi,
    i'm working on a program that capture video from capture card and i need to process 30fps. i'm using WDM and their messages such as "capsetcallbackonframe" to execute "myCallbackFunction" (to acquire images).
    i had set "capprevewrate" to take 30fps, but "mycallbackfunction" is just run 9-10 time per second.(without adds any process to frame)
    i'm really confused, with any changes i've made its not going more than 9 or 10.
    please take a moment if you can help me.

    (sorry if my english is not good as it should be.)

  2. #2
    Frenzied Member Jim Davis's Avatar
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    Re: WDM Video Capturing

    Take a look at here. http://www.gdcl.co.uk/downloads.htm

    FSFWrap and CapStill might be helpful, have you tried them? however these are .dll's so it won't answer your question.

  3. #3

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    Re: WDM Video Capturing

    Tanx a lot Jim Davis.
    No, i've not tried them. but its look usefull. (i heard Direct show work faster than vfw)
    I hope this work.
    I prefer my old codes with a little changes works.
    but i really appreciate that. thank you.
    Last edited by violiance; Nov 1st, 2009 at 11:06 AM. Reason: Cacography

  4. #4
    Frenzied Member Jim Davis's Avatar
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    Re: WDM Video Capturing

    unfortunately i'm not that experienced in image processings, probably someone else here can give you better advises. but as long as i saw, working with DIBs (that these dlls are do) one of the fastest way to get the images.

    take a look at here, it's a nice article that might be an interesting reading for you too.

    http://edais.mvps.org/Tutorials/GDI/DIB/index.html

    i also won't recommend you to invest too much in directx 7/8, since it not supported in vista/win7 anymore, and i've heard reports that their vb libraries are missing.

    edit: this could be the workaround: http://social.msdn.microsoft.com/for...-f5f255c2c679/
    Last edited by Jim Davis; Nov 1st, 2009 at 08:18 PM.

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