NetBSD Problem Report #38208
From steve@mctavish.co.uk Sun Mar 9 16:12:11 2008
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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
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>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
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