From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx3.redhat.com (mx3.redhat.com [172.16.48.32]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id n2QI3KUC005620 for ; Thu, 26 Mar 2009 14:03:20 -0400 Received: from smtp100.biz.mail.re2.yahoo.com (smtp100.biz.mail.re2.yahoo.com [206.190.52.46]) by mx3.redhat.com (8.13.8/8.13.8) with SMTP id n2QI30qR026945 for ; Thu, 26 Mar 2009 14:03:00 -0400 Message-ID: <49CBC35A.40501@migmasys.com> Date: Thu, 26 Mar 2009 14:03:06 -0400 From: Ming Liu MIME-Version: 1.0 To: video4linux-list@redhat.com References: <49C909C8.8050107@migmasys.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: strange problem with KMC-4400R List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: video4linux-list-bounces@redhat.com Errors-To: video4linux-list-bounces@redhat.com List-ID: 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 > > > > -- video4linux-list mailing list Unsubscribe mailto:video4linux-list-request@redhat.com?subject=unsubscribe https://www.redhat.com/mailman/listinfo/video4linux-list