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-mx2.corp.redhat.com (8.13.1/8.13.1) with ESMTP id m89Hq7Mq031257 for ; Tue, 9 Sep 2008 13:52:08 -0400 Received: from smtp110.biz.mail.re2.yahoo.com (smtp110.biz.mail.re2.yahoo.com [206.190.53.9]) by mx3.redhat.com (8.13.8/8.13.8) with SMTP id m89Hq5xM002124 for ; Tue, 9 Sep 2008 13:52:05 -0400 Message-ID: <48C69EC4.3030700@migmasys.com> Date: Tue, 09 Sep 2008 12:05:24 -0400 From: Ming Liu MIME-Version: 1.0 To: video4linux-list@redhat.com References: <20080908160012.574456184D5@hormel.redhat.com> <48C5948D.5030504@migmasys.com> In-Reply-To: <48C5948D.5030504@migmasys.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: a multichannel capture problem 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: Any comments will be helpful. I will really appreciate them. Sincerely yours Ming Ming Liu wrote: >
Hello, > > As a newbie in V4L2, I am trying to capture two video channels > simultaneously (we can live with about 0.05s difference between two > channels). Currently, I am using PV-143 (a cheap card with one bt878 > chip). After some research, I found: > > 1. bt878 can only handle one channel at one time, so I will not be > able to reach a speed higher than 15 frames/second per channel. > 2. Since I can not synchronize the two cameras, I will have much lower > frame rate if I try to switch between two channels. > > My problems are: > > 1. Is there any example codes that I can follow to estimate the frame > rates using switch channel approach? Can I do this by using standard > V4L2 APIs, or I will need to deal with the driver? > 2. If I choose a multi-chip PCI based video capture card, is there any > limit from the bandwidth? Are there any sample codes available? > 3. In the program point of view, is there difference between using > multi-chip card and several single chip cards? > > Thank you in advance. > Sincerely yours > Ming > > >
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