IMAQ-dx acquires at half the expected framerate

I have a USB 2.0 camera that I am using with IMAQ-dx. I currently have the video mode set to 640x480 MJPG 30.00 fps. However, whenever I attempt to use the grab function I get frames returned at about 15 fps, with spikes between about 10 and 19 fps. I have tried using both NI-MAX and property nodes to set the framerate to 30 fps, but while I can set it that way, the camera still acquires images at 15 fps.
Additional information:
I have a second USB camera that I sometimes use at the same time as a first camera. When both cameras are using the grab function, the framerate is the same as when just one camera is (15 fps).
The camera acts the same in both labview 13.0.1f2 and labview 14.0f1. \
I have attached a simple program that I'm using for diagnostic purposes.
Attachments:
camera properties.vi ‏20 KB

How is your exposure on your cameras and lighting situation?

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He who asks the question is a fool for five minutes; he who does not ask the question remains a fool forever.
Attachments:
Image Acquisition VI 0.4.zip ‏187 KB

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Christopher G. Relf
Certified LabVIEW Developer
[email protected]
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204.154.133.0 172.23.248.100 UG 1 0
204.154.130.0 172.23.248.100 UG 1 0
204.154.131.0 172.23.248.100 UG 1 0
204.154.128.0 172.23.248.100 UG 1 0
204.154.129.0 204.154.129.74 U 1 7980 bge0
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172.29.0.0 172.23.248.100 UG 1 0
172.30.0.0 172.23.248.100 UG 1 0
172.31.0.0 172.23.248.100 UG 1 0
172.24.0.0 172.23.248.100 UG 1 0
172.25.0.0 172.23.248.100 UG 1 44
172.26.0.0 172.23.248.100 UG 1 934
172.27.0.0 172.23.248.100 UG 1 0
172.20.0.0 172.23.248.100 UG 1 0
172.21.0.0 172.23.248.100 UG 1 0
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172.16.0.0 172.23.248.100 UG 1 0
172.17.0.0 172.23.248.100 UG 1 0
172.18.0.0 172.23.248.100 UG 1 0
172.19.0.0 172.23.248.100 UG 1 82
10.0.0.0 172.23.248.100 UG 1 1766
224.0.0.0 204.154.129.74 U 1 0 bge0
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204.154.129.209 172.23.248.100 UGH 1 5
172.23.248.0 172.23.248.28 U 1 5757 bge1:3
204.154.126.0 172.23.248.100 UG 1 0
204.154.127.0 172.23.248.100 UG 1 0
204.154.134.0 172.23.248.100 UG 1 0
204.154.135.0 172.23.248.100 UG 1 0
204.154.132.0 172.23.248.100 UG 1 0
204.154.133.0 172.23.248.100 UG 1 0
204.154.130.0 172.23.248.100 UG 1 0
204.154.131.0 172.23.248.100 UG 1 0
204.154.128.0 172.23.248.100 UG 1 0
204.154.129.0 204.154.129.86 U 1 484 bge0:2
204.68.180.0 172.23.248.100 UG 1 0
204.68.181.0 172.23.248.100 UG 1 0
192.168.0.0 172.23.248.100 UG 1 114
172.28.0.0 172.23.248.100 UG 1 2
172.29.0.0 172.23.248.100 UG 1 0
172.30.0.0 172.23.248.100 UG 1 0
172.31.0.0 172.23.248.100 UG 1 0
172.24.0.0 172.23.248.100 UG 1 0
172.25.0.0 172.23.248.100 UG 1 43
172.26.0.0 172.23.248.100 UG 1 944
172.27.0.0 172.23.248.100 UG 1 0
172.20.0.0 172.23.248.100 UG 1 0
172.21.0.0 172.23.248.100 UG 1 0
172.22.0.0 172.23.248.100 UG 1 77
172.23.0.0 172.23.248.100 UG 1 160823
172.16.0.0 172.23.248.100 UG 1 0
172.17.0.0 172.23.248.100 UG 1 0
172.18.0.0 172.23.248.100 UG 1 0
172.19.0.0 172.23.248.100 UG 1 0
10.0.0.0 172.23.248.100 UG 1 183
224.0.0.0 204.154.129.86 U 1 0 bge0:2
default 204.154.129.1 UG 1 1850
127.0.0.1 127.0.0.1 UH 58 225894 lo0:3
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IMAQ-dx acquires at half the expected framerate

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