Re: strange problem with KMC-4400R

[Ming Liu <mliu@migmasys.com>]

Hi, Bill,

Thank you for the reply. Yes, I put one camera to "/dev/video0 channel2" 
and one to "/dev/video1 channel3" in my program.

I tested in two computers: one xubuntu (8.04) and one fedora 6. The 
problem only happens in the xubuntu system. Even I replaced the capture 
card with another KMC-4400R, the problem reappeared on the xubuntu system.

Any comments will be more than helpful.

Sincerely yours
Ming


William M. Brack wrote:
> Hi Ming,
>
> Ming Liu wrote:
>   
>> Hi,
>>
>> I am working on KMC-4400R card. I tried to write a program to use two
>> channels from the card by following the example program of V4l2.
>> However, I met a very strange problem.
>>
>> When I kept capturing image, there were several lines following the
>> moving objects like a ghost (sometimes more than one ghost) on the
>> collected image. I can not figure out what causes this problem and how
>> to fix it. The standard xawtv does not have this problem when only one
>> channel is displayed.
>>
>> Any comments will be helpful and many thanks in advance.
>>
>>     
> The 4400R is a rather strange beast.  There are, basically, four
> controllers (e.g. /dev/video[0..3]) and 16 inputs; each input can go
> to any of the four controllers, and the driver will also allow the
> same input to go to more than one controller.  Each controller,
> however, can display only one input at a time.
>
> Your description sounds as if you are trying to use only one
> controller, and switch it's input back and forth between the two
> cameras.  Assuming you have no more than four cameras (and you said,
> in this case, two), you should assure that each camera goes to a
> separate controller (i.e. instead of using "/dev/video0 channel 1" and
> "dev/video0 channel 2", for the second use "/dev/video1 channel 2". 
> Hopefully that should give a "clean" image for both.
>
>   
>> Sincerely yours
>> Ming
>>
>>     
>
> Regards,
>
> Bill
>
>
>
>   

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