check your version against the known issues and look at the Forum and Faq:

http://www.zoneminder.com/downloads/README.html#_Toc151468577

On Fri, Jul 10, 2009 at 3:28 PM, Jim March<1.jim.march@gmail.com> wrote:
> Folks,
>
> First, I have ALL my issues with network access, apache security,
> DynDNS and the like sorted out.  Cool.
>
> Remaining issue relates to camera resolution:
>
> I have two Hauppauge BT878 camera interface PCI cards with a total of
> 7 cameras on them. The cameras are Swann cheapos; according to the
> specs on the box they're capable of 510x492 resolution (NTSC).
>
> In Cheese I can use them at various resolutions (according to the
> "preferences" setting), with the highest at 768x480, although I don't
> believe it's actually running that resolution.  It's damned well
> better than 320x240 (ZoneMinder's max so far!).  There's also a
> 384x286 mode (in cheese) that is still clearly more than the max so
> far I can enter into Zoneminder of 320x240.  Even a bump to 384x286
> would help.
>
> Telling Zoneminder to drive the cameras at any resolution other than
> 320x240 results in a black screen.
>
> I'm assuming that all seven screens need to be set for the same
> resolution, and am testing it that way. Setting one screen per card
> different from 320x240 breaks the rest on that card.
>
> My guess is that Cheese is getting some unknown different resolution
> from the cameras than anything I know about now.
>
> Is there a command line statement in, say, Xawtv to try and get a
> specific resolution out of the cameras? Something similar to:
>
> xawtv /dev/video0 res-640x480
>
> ...or something?
>
> Any idea why Zoneminder would be stuck hard at 320x240 when the
> cameras are obviously more capable??
>
> Finally, does anybody have a clue as to which IP WiFi cameras might
> work well with Zoneminder?
>
> Thanks!
>
> Jim
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