Topic: Camera advise - Logitech C922 Problems

Hey guys,

I'm sorry in advance for asking something that's eventually pretty basic (for you)...

I'm using Kinovea for a bike fitting setup indoor and it works perfectly when I record a video file (currently using a Canon G5X digital camera with shutter speed set to 1/1000) and analyse the file afterwards.

Now I want to take it a step further... live captured motion analysis.

I thought a cam with 60fps would do the job for the beginning, so I bought a Logitech C922. Unfortunately when I set it up and captured the image in Kinovea it only recorded 10fps @ 720. The maximum frame rate I could get was 30fps with 640, which definetly was not enough!

First question: I don't know how the resolution is connected to the frame rate?! Can someone explain this shortly?!

Second question: I already learned that the frame rate is very dependent on the light situation but it seems, no matter what I do, the C922 doesn't capture more than 10fps in its high res mode (the only mode that allows more than 30fps). Does anyone have the C922 and experienced that problem, too?

Third question: I returned the C922 already and I am now on the lookout for something different. Is there any recommendation you can give for a 60fps camera that works properly? What about that PS3Eye that's been talked about a lot. Or those "china cams" from Ebay?

Thankful for every help / comment!



Re: Camera advise - Logitech C922 Problems

The C922 is among the best you can get.

Make sure you are using the most recent Kinovea version even if it's marked experimental, it has many improvements on the capture side.

The framerate and resolution are largely independent but together they define the total bandwidth that the camera has to process and then send over to the computer. The hardware itself is limited by the amount of data it can capture and then the USB link also has a limit to what can be transferred. USB cameras define a set of framerate and resolution combinations that can be selected.

When you go to the camera parameters dialog in Kinovea you will be able to select the stream format, the resolution and framerate. Resolution and framerate option availability depends on the stream format. Set the format to "MJPEG", this way the video will be compressed directly on the camera and the bandwidth to the computer will be much reduced, allowing to choose the top resolution/framerate combo without frame drops.

The PS3Eye has a really low resolution, I wouldn't recommend it in 2018. Some of the Chinese cameras can be interesting but I don't think they have anything above the flagship Logitech if you are looking for top resolution/framerate.

Re: Camera advise - Logitech C922 Problems

Dear Raphael,
C922 works fine if set the way joan described in his post! I use it with the latest x64 Kinovea version.
It works well even with "suboptimal" light conditions.
If you are looking for something else, give Logitech Brio a try.
There is another recent post in the forum on Brio with more information.
The PS3Eye is indeed not up-to-date anymore, though I am still using them in a very special set-up that cannot be realized with other cams.
Good luck!

- the repairman will never have seen a model quite like yours before -

Re: Camera advise - Logitech C922 Problems

hey guys i have a similar issue as Raphael.
I have a C922 and a Brio 4k.
The brio 4k works flawlessly over USB 3.0 with kinovea: 90 fps 720p, 60 fps 1080p and 30 fps 4k
Sadly the c922 only works well with 30 fps 720p or 30 fps 1080p, but doesnt work properly on 60 fps 720p, if i set it to this setting, it has a real fps rate ob 59,XX which makes recording with both cameras in sync at the same time impossible, as they get immediately out of sync (the brio4k is constantly at 30/60/90 fps as set).
I searched the internet, found that logitech suggests to turn off the low light option, but no difference.
I tried it on two rather powerful pcs - dell xps 9370 with i7 8550u, 16gb ram and ssd, as well as ryzen 1700x at 3,9ghz, 32gb ram and ssd. In both instances the c922 made the same issues and the brio worked flawlessly.
Does anyone have an idea? Is it just that the c922 is actually by design like  it (usb 2.0) and cant be helped, or do i ahve to change some settings, or perhaps mine is defective? Getpa you said you are very happy with it.
Thanks in advance