NetBSD Problem Report #38208

From steve@mctavish.co.uk  Sun Mar  9 16:12:11 2008
Return-Path: <steve@mctavish.co.uk>
Received: from mail.netbsd.org (mail.netbsd.org [204.152.190.11])
	by narn.NetBSD.org (Postfix) with ESMTP id 9D81463B8E3
	for <gnats-bugs@gnats.NetBSD.org>; Sun,  9 Mar 2008 16:12:11 +0000 (UTC)
Message-Id: <20080309161209.19DA3D4C78@joe.mctavish.co.uk>
Date: Sun,  9 Mar 2008 16:12:09 +0000 (GMT)
To: gnats-bugs@gnats.NetBSD.org
Subject: bktr(4) stuck at 12.5 fps in PAL mode with RGB pixel format
X-Send-Pr-Version: 3.95

>Number:         38208
>Category:       kern
>Synopsis:       bktr(4) stuck at 12.5 fps in PAL mode with RGB pixel format
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 09 16:15:03 +0000 2008
>Last-Modified:  Thu Jun 03 10:29:29 +0000 2021
>Originator:     Steve Woodford
>Release:        NetBSD 4.99.49
>Organization:

>Environment:


System: NetBSD joe.mctavish.co.uk 4.99.49 NetBSD 4.99.49 (JOE) #3: Thu Feb 7 13:55:32 GMT 2008 steve@horace.mctavish.co.uk:/export/netbsd/local/netbsd/sys/arch/i386/compile/JOE i386
Architecture: i386
Machine: i386
>Description:
When sampling PAL video in RGB mode, the bktr(4) driver (using
METEOR_CAP_CONTINOUS) does not supply frames at the full 25 fps rate.
The frames are, instead, supplied at 12.5 fps. If switched to YUV mode,
the driver works correctly; the application receives video at 25 fps.

I don't have an NTSC source so I can't tell for sure if this problem is
specific to PAL. Looking at the driver however, different RISC code is
used for PAL/SECAM RGB compared to NTSC RGB (it's different again for YUV)
which leads me to believe that this problem could be caused by a bug in
the PAL RGB RISC code. There's additional stuff in the PAL RGB code to
deal with VBI data...
>How-To-Repeat:
Try to sample a PAL video in RGB mode. Note that you get 12.5 fps instead
of 25.
>Fix:
Unknown.

>Release-Note:

>Audit-Trail:

>Unformatted:
 bktr(4) stuck at 12.5 fps in PAL mode with RGB pixel format

NetBSD Home
NetBSD PR Database Search

(Contact us) $NetBSD: query-full-pr,v 1.46 2020/01/03 16:35:01 leot Exp $
$NetBSD: gnats_config.sh,v 1.9 2014/08/02 14:16:04 spz Exp $
Copyright © 1994-2020 The NetBSD Foundation, Inc. ALL RIGHTS RESERVED.