From owner-freebsd-multimedia Sun Feb 23 14:22:05 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id OAA05326 for multimedia-outgoing; Sun, 23 Feb 1997 14:22:05 -0800 (PST) Received: from DNS.Lamb.net (root@DNS.Lamb.net [207.90.181.1]) by freefall.freebsd.org (8.8.5/8.8.5) with ESMTP id OAA05319 for ; Sun, 23 Feb 1997 14:22:02 -0800 (PST) Received: from Bitch2.Melmac.org (Bitch2.Melmac.org [207.90.181.43]) by DNS.Lamb.net (8.8.5/20.74.3.14) with ESMTP id OAA14908; Sun, 23 Feb 1997 14:22:02 -0800 (PST) Received: (from ulf@localhost) by Bitch2.Melmac.org (8.8.3/8.7.6) id OAA02007; Sun, 23 Feb 1997 14:22:05 -0800 (PST) From: Ulf Zimmermann Message-Id: <199702232222.OAA02007@Bitch2.Melmac.org> Subject: Re: Teletext decoding To: luigi@labinfo.iet.unipi.it (Luigi Rizzo) Date: Sun, 23 Feb 1997 14:22:05 -0800 (PST) Cc: multimedia@freebsd.org In-Reply-To: <199702232114.WAA20000@labinfo.iet.unipi.it> from Luigi Rizzo at "Feb 23, 97 10:14:18 pm" X-Mailer: ELM [version 2.4ME+ PL22 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-multimedia@freebsd.org X-Loop: FreeBSD.org Precedence: bulk I once wrote a program to download raw videotext data from the chip via I2C bus and decode them completly. Was running under Windows. I should still have somewhere the software. > Hi, > > if someone is interested in decoding Teletext/Videotext data acquired > with a frame grabber, I have some code which does the job. You need > your frame grabber to acquire the lines containing teletext data > (usually before the visible area); a simple patch to the meteor driver > does the job, I assume th bt848 driver can also do the same thing. > The sampling rate is not exceedingly important (provided it is high > enough, e.g. 640 pixels) since I use a routine from sox to do the > resampling with the correct values. > > Those interested can send me email for a copy. > > Luigi > -----------------------------+-------------------------------------- > Luigi Rizzo | Dip. di Ingegneria dell'Informazione > email: luigi@iet.unipi.it | Universita' di Pisa > tel: +39-50-568533 | via Diotisalvi 2, 56126 PISA (Italy) > fax: +39-50-568522 | http://www.iet.unipi.it/~luigi/ > _____________________________|______________________________________ > Ulf. -------------------------------------------------------------------------- Ulf Zimmermann, 1525 Pacific Ave., Alameda, CA-94501, #: 510-769-2936 Alameda Networks, Inc. | http://www.Alameda.net