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 Post subject: 4 cameras problem
PostPosted: Sat Apr 06, 2013 8:00 am 

Joined: Sat Apr 06, 2013 7:40 am
Posts: 2
Hello,

I use 4 cameras with Ipi recorder, which are all recognized but only 3 are giving me a picture. Althought, the one that doesn't work, works when I switch it alone.

Thank you ; Sorry but I'm French


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 Post subject: Re: 4 cameras problem
PostPosted: Sun Apr 07, 2013 1:07 pm 
iPi Soft

Joined: Wed Jan 11, 2012 6:12 am
Posts: 2039
Location: Moscow, Russia
Hi
I see other cameras also have very low frame rate. This may be the USB bandwidth issue, or the performance problem of selected web camera model.
Have you tried all posible USB ports combinations?
What PC do you use - desktop or laptop?
What camera models do you use?


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 Post subject: Re: 4 cameras problem
PostPosted: Sun Apr 07, 2013 1:27 pm 

Joined: Sat Apr 06, 2013 7:40 am
Posts: 2
It's a laptop computer and yes, I've tried all the combinations. I use a low quality webcam


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 Post subject: Re: 4 cameras problem
PostPosted: Mon Apr 08, 2013 12:20 am 
iPi Soft

Joined: Wed Jan 11, 2012 6:12 am
Posts: 2039
Location: Moscow, Russia
How many USB ports does your laptop have? It is possible that they all are mapped to a single USB controller. In that case, its bandwidth may be too low to handle 4 cams.
Potentially, there may be some USB compatibility issues. Try to plug each of the cameras individually in each USB port to find whether there are some non-working combinations of specific camera with specific port.
The problem with most wecams, particularly low quality ones, is that they rarely can maintain frame rate at stable level, especially at high values. And that makes recordings virtually unusable for mocap. That is why we recommend to use PS Eye camera. It provides very stable frame rate up to 60fps.


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