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 m7R307BY009345 for ; Tue, 26 Aug 2008 23:00:07 -0400 Received: from yx-out-2324.google.com (yx-out-2324.google.com [74.125.44.29]) by mx3.redhat.com (8.13.8/8.13.8) with ESMTP id m7R2xtmj010842 for ; Tue, 26 Aug 2008 22:59:55 -0400 Received: by yx-out-2324.google.com with SMTP id 31so1153538yxl.81 for ; Tue, 26 Aug 2008 19:59:55 -0700 (PDT) Message-ID: <48B4C328.2040502@gmail.com> Date: Tue, 26 Aug 2008 22:59:52 -0400 From: Robert William Fuller MIME-Version: 1.0 To: Trent Piepho References: <200808251445.22005.jdelvare@suse.de> <1219711251.2796.47.camel@morgan.walls.org> <20080826232913.GA2145@daniel.bse> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Cc: v4l-dvb-maintainer@linuxtv.org, video4linux-list@redhat.com, Jean Delvare Subject: Re: [v4l-dvb-maintainer] bttv driver questions 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: Trent Piepho wrote: > On Wed, 27 Aug 2008, Daniel [iso-8859-1] Gl�ckner wrote: >> On Mon, Aug 25, 2008 at 08:40:51PM -0400, Andy Walls wrote: >>> On Mon, 2008-08-25 at 14:45 +0200, Jean Delvare wrote: >> The driver fills buffers with instructions for the DMA engine, one buffer >> for the top field and one for the bottom field. These instructions tell >> the engine where to write a specific pixel. For interlaced video the >> instructions for the top field write to line 0, 2, 4, ... in memory and for >> the bottom field to line 1, 3, 5, ... . > > Keep in mind that _either_ field can be transmitted first. I.e., in some > cases one first writes lines 1,3,5 then lines 0,2,4. I'm not sure if bttv > supports both field dominances or not, but I think it does. My particular board always returns top field first on capture. I don't know if that helps. -- video4linux-list mailing list Unsubscribe mailto:video4linux-list-request@redhat.com?subject=unsubscribe https://www.redhat.com/mailman/listinfo/video4linux-list