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Maximum frame rate is capped at 60 frames per second?

 
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Lightningwizard



登録日: 2007.10.19
記事: 165

記事日時: Sat Jul 23, 2016 9:54 am    記事の件名: Maximum frame rate is capped at 60 frames per second? 引用付きで返信

Hi SonotaCo,

I am playing with frame rates of my Point Grey camera. I will soon upgrade my laptop to one that hopefully eliminates my bottleneck of 19 fps in 1920x1200 mode. The camera is capable of 87 fps (even 163 in raw8, but it cannot be used by UFOCaptureHD).

My test is succesful for 2x2 binning giving a clean 960x600 @ 60 fps image in UFOCapture without frame drops (some slight banding only). The brightness increase is equivalent to a 4x longer exposure time. Looks good for meteors, better than Watec, although it is a serious resolution downgrade.

My test of 4x4 binning with an image of 480x300 pixels gives me the maximum in the manufacturer's software, 87 fps without frames dropped. However, in UFOCaptureHD it only gives intervals of 17 ms suggesting a software-controlled limit at 60 fps. The same happens if I select a ROI and I can save effectively 100 frames per second. Would it be possible to remove this limit?

best regards,
Oscar



example960x600.PNG
 説明:
960x600 60 fps, with moonlight
 ファイルサイズ:  590.33 KB
 閲覧数:  5930 回

example960x600.PNG



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登録日: 2004.08.07
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記事日時: Sat Jul 23, 2016 7:56 pm    記事の件名: Re: Maximum frame rate is capped at 60 frames per second? 引用付きで返信

Hi Oscar
Thanks for report.

Lightningwizard wrote:
in UFOCaptureHD it only gives intervals of 17 ms suggesting a software-controlled limit at 60 fps.


I checked my source code now, but I could not find the cause.
There is a limit of 120 fps in UFOCaputreHD2, but not 60 fps nor 1/60 sec.
I don't have testing environment over 60fps, so cannot test this.
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Lightningwizard



登録日: 2007.10.19
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記事日時: Thu Jul 28, 2016 4:16 am    記事の件名: 引用付きで返信

Thanks for your answer, SonotaCo. I will check again once I have a new laptop.
Oscar

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Lightningwizard



登録日: 2007.10.19
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記事日時: Sat Nov 05, 2022 2:51 am    記事の件名: Result with new laptop (2022) 引用付きで返信

Hi SonotaCo!

I am now using a new Asus ProArt Studiobook 16 (2021)

I am happy to report that with the PointGrey/FLIR Grasshopper3 IMX174 at full 1920x1200 resolution I can now finally get beyond the previous 20 fps without frames dropping. It took 8 years Wink

From my initial testing, at full resolution I still don't hit the 87 fps even in FlyCapture software. The frame drops indicate I can reach about 75% of that. So 50 or 60 fps seems possible!

On the other hand, in binning 960x600 mode, I get 87 fps easily without drops, while in UFOCaptureHD it is still a perfect 60 frames per second (using NTP clock display in the video frames). It may be the DirectShow driver supplied by FLIR or some limitation in Windows?

best regards,
Oscar

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所在地: 139.67E 35.65N

記事日時: Sat Nov 05, 2022 9:52 am    記事の件名: 引用付きで返信

Hi Oscar
The cause of frame-dropping video being recorded is almost always insufficient CPU or storage processing power. I don't think device driver can cause this directly.
Since recent CPUs have a large number of parallel execution threads, care should be taken to check their performance.
For example, a CPU with 8 cores and 16 threads can reach its processing capacity limit at 1/16th of the total CPU load, or 6.25%.
The same applies to the storage write speed, which must be capable of writing the expected file size during its real time.

below is the 10 camera system of my station, where frames drops are not happen.



ws001080_114.jpg
 説明:
 ファイルサイズ:  97.63 KB
 閲覧数:  1019 回

ws001080_114.jpg


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Lightningwizard



登録日: 2007.10.19
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記事日時: Thu Nov 10, 2022 5:31 am    記事の件名: 引用付きで返信

Hi SonotaCo,

That is an amazing system!
Yes, frame drops in the native PointGrey/FLIR FlyCapture software seem to occur because some CPU or system bandwidth limits were reached soon after pressing record, while fps sent and received were equal.

But I know I can capture 87 fps in binning mode, because the image is 4x smaller, and data transfer should be acceptable. I once tested 300 fps at cropped image section, but when trying it in UFOCapture it showed a steady 60 fps cadence. So I think somehow the manufacturer forgot to raise the speed limit on the DirectShow driver. It does not simply drop frames. The time stamps are super predictable 17 ms intervals. It is like the application ignores the speed saved in the camera or FlyCapture and puts a maximum 60 fps instead.

Oscar

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