QHY183C
25
11. The FPS of cameras sometimes suddenly drops to zero under DDR mode on
SharpCap, what’s the solution for this problem?
Recently, we have been told by our users that the FPS of their cameras sometimes suddenly drops
to zero under DDR mode on SharpCap. It is caused by the fact that the receiving speed of computer
is relatively slower than the sending speed of camera. Once CMOS sensor starts working, it will
incessantly conduct exposure and output image data over and over again, and it cannot be
interrupted. If USB transmission was interrupted too often by the operating system, the data
overflow of DDR would ensue resulting in bad frame. Therefore, not a single frame is a complete
frame, and the FPS will drop to zero.
Solutions:
The first solution to this problem is to increase the value of USB traffic to decrease the FPS of the
cameras. Note that by using previous version of SharpCap Patch, the value of USB traffic cannot be
set to a value large enough, so you should go to our website to download the latest version of
SharpCap Patch.
The second solution to this problem is to turn off the DDR mode, but for computers whose
performance isn’t very good, this solution may not work very well.
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