From owner-freebsd-multimedia  Wed Apr 16 20:49:38 1997
Return-Path: <owner-multimedia>
Received: (from root@localhost)
          by freefall.freebsd.org (8.8.5/8.8.5) id UAA04401
          for multimedia-outgoing; Wed, 16 Apr 1997 20:49:38 -0700 (PDT)
Received: from rah.star-gate.com (rah.star-gate.com [204.188.121.18])
          by freefall.freebsd.org (8.8.5/8.8.5) with ESMTP id UAA04395
          for <multimedia@freebsd.org>; Wed, 16 Apr 1997 20:49:35 -0700 (PDT)
Received: from rah.star-gate.com (localhost.star-gate.com [127.0.0.1]) by rah.star-gate.com (8.8.5/8.7.3) with ESMTP id UAA00297; Wed, 16 Apr 1997 20:48:59 -0700 (PDT)
Message-Id: <199704170348.UAA00297@rah.star-gate.com>
X-Mailer: exmh version 1.6.9 8/22/96
To: Doug White <dwhite@resnet.uoregon.edu>
cc: "Louis A. Mamakos" <louie@TransSys.COM>,
        Randall Hopper <rhh@ct.picker.com>, multimedia@freebsd.org
Subject: Re: Bt848 Missing frames fix 
In-reply-to: Your message of "Wed, 16 Apr 1997 20:27:02 PDT."
             <Pine.BSF.3.96.970416202148.14484A-100000@localhost> 
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Date: Wed, 16 Apr 1997 20:48:58 -0700
From: Amancio Hasty <hasty@rah.star-gate.com>
Sender: owner-multimedia@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

>From The Desk Of Doug White :
> On Wed, 16 Apr 1997, Louis A. Mamakos wrote:

> That was me, I think.  I suppose we could swap the even/odd reads and see
> if the image looks any different. I can check it by clicking over to the
> Weather Channel or watching ESPN or any matter of channels with lots of
> graphics.  Oh, don't look at ME to do that.  

Don't worry I did it over here and I didn't see any difference.

If anyone is interested in trying it out just look in bt848.c:rgb_prog.

target_buffer is initialized to the start of the field. To start in 
an odd line set :
target_buffer = buffer + pitch;

To start in an even line:
target_buffer = buffer;


I think what folks are seeing is aliasing effects.

	Enjoy,
	Amancio