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SharpCap rejecting lots of subs

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#1 audioengr

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Posted 21 September 2021 - 12:28 PM

Last night I captured some Jupiter videos and I set my 178 camera to lowest res so that I could get 30 frames per second or more for a 2 minute capture.  I wanted several thousand frames in 2 minutes.  The camera is connected with a known good USB3 cable.

 

SharpCap starts out doing 31 frames per second and then after about 10 seconds it drops to around 12 frames per second, rejecting more than 50% of the frames.  It was a really good night and the image was not moving and very little atmospherics.  Nice clear bands on Jupiter.

 

Why is it doing this? Is there a setting I'm not seeing that stops this rejection from happening?  Is there too much background activity on my computer?

 

Thanks


Edited by audioengr, 21 September 2021 - 12:30 PM.


#2 wargrafix

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Posted 21 September 2021 - 12:51 PM

is it happening in firecapture?



#3 Mark Lovik

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Posted 21 September 2021 - 01:19 PM

Sounds like buffering and a slower connection, could even be on the computer side - are you connecting to a USB2 computer port?  I have a color and monochrome versions of this camera and can stream full res at good frame rates without any drop-off in speed.

 

I use now use ROI because it takes no time at all to generate 20G in a stream -- sigh. 


Edited by Mark Lovik, 21 September 2021 - 01:20 PM.


#4 jgraham

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Posted 21 September 2021 - 01:27 PM

I see something similar on & off. In my case it seems to be tied to a cluttered USB bus and background tasks. To clean up the USB bus I minimize the number of USB devices connected. To reduce background tasks I’ll shut down my computer and execute a cold boot before I start imaging. I also reduce the region of interest to minimize the frame size. This all seems to help.



#5 audioengr

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Posted 22 September 2021 - 02:37 PM

I tried again another night after rebooting the laptop and stopping all other apps.  It seemed to improve a bit, but still came down from 30 fps or 60 fps to 12 fps after about 30-45 seconds of captures.  I even unplugged the USB mouse - no effect.

 

Maybe I should try a different USB port?  I have two of them on this particular laptop.  I could also get an adapter and use the "C" port.




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