From: Michael Schimek <mschimek@gmx.at>
To: Andy Walls <awalls@radix.net>
Cc: video4linux-list@redhat.com
Subject: Re: Need VIDIOC_CROPCAP clarification
Date: Sun, 08 Jun 2008 14:27:25 +0200 [thread overview]
Message-ID: <1212928045.17465.1044.camel@localhost> (raw)
In-Reply-To: <1212805718.3168.99.camel@palomino.walls.org>
On Fri, 2008-06-06 at 22:28 -0400, Andy Walls wrote:
> On Sat, 2008-06-07 at 00:29 +0200, Michael Schimek wrote:
>
> > As Daniel wrote, another way to view this is that the active portion of
> > the video is about 52 µs wide. At 12.27 MHz (for NTSC square pixels) one
> > would sample or "crop" 638 pixels over this period.
>
>
> Actually since the NTSC line frequency is
>
> Fh = 4.5 MHz/286 ~= 15.73426 kHz
I know. Do I have to give three decimal places for every single video
standard to explain the basic idea? ;-)
Michael
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next prev parent reply other threads:[~2008-06-08 13:09 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-26 21:26 Need VIDIOC_CROPCAP clarification Hans Verkuil
2008-05-27 1:16 ` Andy Walls
2008-05-27 6:53 ` Hans Verkuil
2008-05-27 7:00 ` Hans Verkuil
2008-05-27 23:14 ` Andy Walls
2008-06-06 22:29 ` Michael Schimek
2008-06-07 1:33 ` Daniel Glöckner
2008-06-08 12:27 ` Michael Schimek
2008-06-08 16:55 ` Daniel Glöckner
2008-06-07 2:28 ` Andy Walls
2008-06-08 12:27 ` Michael Schimek [this message]
2008-06-11 18:49 ` Hans Verkuil
2008-06-11 20:15 ` Daniel Glöckner
2008-05-27 23:24 ` Andy Walls
2008-05-28 2:19 ` Daniel Glöckner
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