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View Full Version : Low frame rate in DFK 31BF03



togaen
February 16, 2010, 16:53:13
I have two DFK 31BF03 cameras, and am only getting 3.75fps in UYVY, and 7.5fps in BY8 with them. The current machine they are on is a Pentium 4 3.2GHz with 2GB of RAM, and when I test either of them, they are the only devices on the firewire bus. I've also tried them on two other machines with exactly the same results. When I launch IC Capture 2.1, I get this error:

Error: Live mode could not be started. Please make sure no other program uses the device and that there is enough bandwidth on your firewire bus available.

If I set the frame rate low enough, I do not get that error. I've installed the latest drivers from the web site, but get the same results. Is there anything else I could be checking to fix the problem?

togaen
February 16, 2010, 17:10:36
I should also say that, using coriander on Linux, I was able to get 30fps, but only in monochrome. I don't have the option for monochrome in IC Capture 2.1.

Stefan Geissler
February 17, 2010, 09:32:45
Hello,

may be you have the 1394b issue of Windows XP:

The Performance of 1394 devices may decrease after you install Windows XP Service Pack 2

Please refer to http://support.microsoft.com/kb/885222

After you update your computer to Microsoft Windows XP Service Pack 2 (SP2), the performance of your 1394a or 1394b FireWire devices may be greatly decreased. A digital camera that uses S400 speed is an example of such a device. This problem occurs if you connect a 1394a or 1394b FireWire device to a 1394b port. This problem occurs because Windows XP SP2 changes 1394b ports to S100 speed when you upgrade.

This hotfix is not implemented in SP3 too.

togaen
February 19, 2010, 02:04:43
I have tried installing the hotfix, but it does not help; perhaps I'll see if we can get a newer version of Windows on that machine.

I was, however, having the same trouble on Linux. Is there a similar issue with Linux?

Stefan Geissler
February 19, 2010, 12:17:50
Hello,

the monochrome option in IC Capture is Y800. Also BY8 has, like Y800 only 1 byte per pixel. Thus these formats should have 30 fps. The UYVY video foramt needs two bytes per pixel, thus the maximum frame rate is only 15 fps.