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 m88L9mPH013439 for ; Mon, 8 Sep 2008 17:09:48 -0400 Received: from smtp107.biz.mail.re2.yahoo.com (smtp107.biz.mail.re2.yahoo.com [206.190.52.176]) by mx3.redhat.com (8.13.8/8.13.8) with SMTP id m88L9aVg005355 for ; Mon, 8 Sep 2008 17:09:36 -0400 Message-ID: <48C5948D.5030504@migmasys.com> Date: Mon, 08 Sep 2008 17:09:33 -0400 From: Ming Liu MIME-Version: 1.0 To: video4linux-list@redhat.com References: <20080908160012.574456184D5@hormel.redhat.com> In-Reply-To: <20080908160012.574456184D5@hormel.redhat.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: 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: 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 -- video4linux-list mailing list Unsubscribe mailto:video4linux-list-request@redhat.com?subject=unsubscribe https://www.redhat.com/mailman/listinfo/video4linux-list