From owner-freebsd-multimedia Sun Dec 9 5:28:16 2001 Delivered-To: freebsd-multimedia@freebsd.org Received: from kumr.lns.com (kumr.lns.com [63.198.122.138]) by hub.freebsd.org (Postfix) with ESMTP id 8D14337B416 for ; Sun, 9 Dec 2001 05:28:12 -0800 (PST) Received: (from pozar@localhost) by kumr.lns.com (8.11.6/8.9.3) id fB9DQmJ73809; Sun, 9 Dec 2001 05:26:48 -0800 (PST) (envelope-from pozar) Date: Sun, 9 Dec 2001 05:26:48 -0800 From: Tim Pozar To: User Raymond Cc: freebsd-multimedia@FreeBSD.ORG Subject: Re: Using a Brooktree grabber as a security device Message-ID: <20011209052648.A72407@lns.com> References: <200112090915.TAA31024@gw.one.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <200112090915.TAA31024@gw.one.com.au>; from raymond@one.com.au on Sun, Dec 09, 2001 at 07:15:28PM +1000 Sender: owner-freebsd-multimedia@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org I am doing exactly this right now. At this point I am saving 640x480 images as JPEGs once a minute and then converting these into MPEG files. Unfortunately this rate is just too slow to pick up wanted action. If I did sample faster, say once a second, I would be needing almost 3GB a day in images or about 5GB for MPEG video files. It also makes it harder to find the frames I want. Ideally you want software that does motion detection (such as edge, etc.) that will only save frames that have significant changes in them at a quick rates in order to capture as much as possible. I am currently experimenting with a number of methods and packages to do this. I will get back to folks with the end result. Tim On Sun, Dec 09, 2001 at 07:15:28PM +1000, User Raymond wrote: > I have been given the job of implementing some security cameras, > so I have purchased a Brooktree based frame grabber > (bktr0: Askey/Dynalink Magic TView, Temic NTSC tuner) and a couple > of CCD cameras (one B/W and one colour). > > At this point, I must admit to a very sketchy knowledge of multimedia > in general and video in particular. > > I headed for the ports and looked at xawtv, fxtv and a few others and > just became more confused - I can view what the camera sees, I can save > this to a series of jpegs and there is a wealth of software there. > My problem, then, what is the best way to do this; a series of jpegs > (say two a second) or some form of video. I want to be able to keep > (on a 40GB disk) up to a week of "film" and I want to be able to view > this from a specified point in time. > > Any pointers gratefully received. > > > Ray Newman > Message sent at 07:21 PM on 09 Dec 2001 by PUP::RAYMOND. Id: 130344. > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-multimedia" in the body of the message -- Snail: Tim Pozar / LNS / 1978 45th Ave / San Francisco CA 94116 / USA POTS: +1 415 665 3790 Radio: KC6GNJ / KAE6247 "It's a damn poor mind that can only think of one way to spell a word." - Andrew Jackson "What is wanted is not the will to believe, but the will to find out, which is the exact opposite." - Bertrand Russell, "Skeptical_Essays" To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message