Hi,
I wanna put in a suggestion for the custom Frame rate limit setting. I am currently using the Spectroheliograph for scanning the Sun and the ability to limit the FPS to a certain rate came in very handy since we need the frame rate to match the scan speed of the mount. I know Sharpcap do this frame rate limit by discarding the excess frames and that's fine by me, I want the ability to input the custom frame rate instead of relying on fixed options (like 60, 120, 240 etc...)
Thanks!
Custom frame rate limit
Forum rules
'+1' posts are welcome in this area of the forums to indicate your support for a particular feature suggestion. Suggestions that get the most +1's will be seriously considered for inclusion in future versions of SharpCap.
'+1' posts are welcome in this area of the forums to indicate your support for a particular feature suggestion. Suggestions that get the most +1's will be seriously considered for inclusion in future versions of SharpCap.
Re: Custom frame rate limit
Great idea for spectroheliograph use. I would fine that very useful
Brian
Brian
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admin
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Re: Custom frame rate limit
Hi,
unfortunately, this won't really help you - setting this control to (say) 60fps doesn't cause the camera to run at exactly 60fps. Instead it causes SharpCap to discard frames from the camera as required to make sure that the retained frames are at a rate of 60fps or below. If the camera is naturally running at 90fps then SharpCap will (roughly) keep 2, drop 1, keep 2, drop 1, etc.
This is no good when you want the camera to run at an exact frame rate. In fact most cameras do not provide a way to specify an exact frame rate directly when running in high speed mode - you have to tinker with settings like ROI, exposure, USB speed, etc to fine tune the frame rate that you want based.
cheers,
Robin
unfortunately, this won't really help you - setting this control to (say) 60fps doesn't cause the camera to run at exactly 60fps. Instead it causes SharpCap to discard frames from the camera as required to make sure that the retained frames are at a rate of 60fps or below. If the camera is naturally running at 90fps then SharpCap will (roughly) keep 2, drop 1, keep 2, drop 1, etc.
This is no good when you want the camera to run at an exact frame rate. In fact most cameras do not provide a way to specify an exact frame rate directly when running in high speed mode - you have to tinker with settings like ROI, exposure, USB speed, etc to fine tune the frame rate that you want based.
cheers,
Robin
Re: Custom frame rate limit
Hi Robin,admin wrote: ↑Wed Aug 28, 2024 2:35 pm Hi,
unfortunately, this won't really help you - setting this control to (say) 60fps doesn't cause the camera to run at exactly 60fps. Instead it causes SharpCap to discard frames from the camera as required to make sure that the retained frames are at a rate of 60fps or below. If the camera is naturally running at 90fps then SharpCap will (roughly) keep 2, drop 1, keep 2, drop 1, etc.
This is no good when you want the camera to run at an exact frame rate. In fact most cameras do not provide a way to specify an exact frame rate directly when running in high speed mode - you have to tinker with settings like ROI, exposure, USB speed, etc to fine tune the frame rate that you want based.
cheers,
Robin
That's exactly what we need with spectroheliograph (keep and drop frame to match the target frame rate). And I do not need exact frame rate, just a ball park is good enough. A bit of over sampling does not hurt the image quality. Limit the frame rate also limit the file size. So a custom frame rate limit would help me a lot. Any chance this can be implemented in near future?
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Jean-Francois
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- Location: Germany
Re: Custom frame rate limit
Hello,
It is not a so good idea to discard some of the frames during a scan with the spectroheliograph.
Ideally is to have a constant frame frequency. It is not easy with Windows computer.
What you want is a stable fps during saving in a SER file.
What is your mount ? And how do you control it ?
Do you know my script for the capture of the spectroheliograph films ?
It is now 1 ... or 2 years ago. I have somewhere a new version, but with some bugs.
So it is better to try my old script.
With my script and a mount that allows all the rates (not only the pre-defined hand controller rates),
you can with only *one" click start the capture and the telescope scan ... and with *one* click you can stop both at the same time.
And that without to press a button non-stop.
In addition ... my script calculates for you the best telescope rate for your actual settings.
Regards,
Jean-Francois
It is not a so good idea to discard some of the frames during a scan with the spectroheliograph.
Ideally is to have a constant frame frequency. It is not easy with Windows computer.
What you want is a stable fps during saving in a SER file.
What is your mount ? And how do you control it ?
Do you know my script for the capture of the spectroheliograph films ?
It is now 1 ... or 2 years ago. I have somewhere a new version, but with some bugs.
So it is better to try my old script.
With my script and a mount that allows all the rates (not only the pre-defined hand controller rates),
you can with only *one" click start the capture and the telescope scan ... and with *one* click you can stop both at the same time.
And that without to press a button non-stop.
In addition ... my script calculates for you the best telescope rate for your actual settings.
Regards,
Jean-Francois
Re: Custom frame rate limit
Hi Jean-Francois,Jean-Francois wrote: ↑Wed Aug 28, 2024 7:44 pm Hello,
It is not a so good idea to discard some of the frames during a scan with the spectroheliograph.
Ideally is to have a constant frame frequency. It is not easy with Windows computer.
What you want is a stable fps during saving in a SER file.
What is your mount ? And how do you control it ?
Do you know my script for the capture of the spectroheliograph films ?
It is now 1 ... or 2 years ago. I have somewhere a new version, but with some bugs.
So it is better to try my old script.
With my script and a mount that allows all the rates (not only the pre-defined hand controller rates),
you can with only *one" click start the capture and the telescope scan ... and with *one* click you can stop both at the same time.
And that without to press a button non-stop.
In addition ... my script calculates for you the best telescope rate for your actual settings.
Regards,
Jean-Francois
The way Sharpcap discard frames (apparently by discard frames periodically so it works exceedingly well with SHGs). it maintains a stable FPS throughout the capture. I made several animation using this frame discarding technique and yes, since I cannot specify a frame rate, I resorted to using a custom slew speed using scripting tool to match the 120fps (I now have to slew at 6x sidereal to match the fps). So a customized FPS limiter is very welcomed.
