updated 1999-01-06.
see also
Fachhochschule Konstanz, Brauneggerstrasse 55, 78462 Konstanz, Germany
Konstanz University of Applied Science
Indexes to webcams
Some livecams use a JavaScript like this:
<body onload="startClock()">
...
<form name="my_timer_box">
<p>
This page will reload in
<input type="text" name="clock" value="" size=2>
seconds.
</form>
...
<SCRIPT language="JavaScript">
<!-- HIDING
var x = 61
var y = 1
function startClock(){
x = x-y
document.my_timer_box.clock.value = x
timerID = setTimeout("startClock()", 1000)
}
// END HIDING -->
</SCRIPT>
Delivered-To: quickcam-drivers at crynwr.com From: MIKE DENTSubject: Re: Live video from UK using quickcam To: zsolt at direct.ca (George Cserenyi) Date: Mon, 24 Feb 1997 16:55:02 +0000 (GMT) > > Success at last! > Got up early today, before the lights went out in Mike's office, > got the wonderful and addictive video both on the linux box and > on the win95 box behind the firewall. (I'm looking at you Mike now :))) Glad it works for you. I doubt it was me you saw though, I was off on Friday. I sit at the desk nearest the camera, I'm the one with specs on! > After a frame was done, abt. 50k, data kept on comming, but there was > no change in the picture. By pressing ^R in netscape, I've got a new > image. Could this be automated somehow? I have noticed that the Linux version of Netscape does not seem to continue receiving the video stream for the 5 mins it should, sometimes it only seems to rx it for a min or so, then I have to hit reload? However win95 and NT versions seem to cope ok with this and usually receive the full 5 mins before having to hit reload? Anyway if you find the image all black, we have the lights out. Times are about 0830 to 1730 GMT wekdays only. > I was able to save the video stream into a file, but don't know, > what extention should be given to it, so netscape could play it back. I'd be interested if you manage to do anything with this. > Congrats Mike! Thanks, and thanks to the folks that wrote this stuff! Mike > George > > On Thu, 20 Feb 1997, MIKE DENT wrote: > > > For those interested I have put my color quickcam on the web for your viewing pleasure. > > It is using the quickcam-grabber and streamserver. I think you need Netscape to > > view the page, internet exploder does not seem to like it. > > It can be found at http://miked.lancs.ac.uk/color-video.html > > You probbaly will not see anything on the camera unless you view between about > > 08:30 and 17:30 GMT weekdays. > > Cheers > > Mike > > > > > >
I've heard rumors that some people put web cams in day cares. Is this true ?
Delivered-To: mailing list quickcam-drivers at crynwr.com X-Authentication-Warning: dhcp230.sprintranet.com: aforma owned process doing -bs Date: Wed, 3 Mar 1999 08:19:26 -0600 (CST) From: Anthony Forma <aforma at iname.com> X-Sender: aforma at dhcp230.sprintranet.com To: Pascal Roulin <pascal at le-shop.ch> cc: Rex Johnson <rexjohns at bellatlantic.net>, quickcam-drivers at crynwr.com Subject: Re: Web Page Doesn't Refresh On Wed, 3 Mar 1999, Pascal Roulin wrote: > Does an answer exist, less fuzzy ?? :-) > > >Can anyone tell me how to make the images refresh automatically so that > >the newest cam.jpg is always displayed? Using an 'Expires' header is the only sure-fire way I've found. Reference a cgi wrapper from your html, e.g. <img src="wrap.cgi"> and wrap.cgi would look like: #!/bin/sh echo "Expires: Friday, 30-Sep-94 12:00:00 GMT" echo "Content-type: image/jpeg" echo cat cam.jpg That should solve your problems. Anthony Anthony Forma - Sprint Paranet Mailing-List: contact quickcam-drivers-help@crynwr.com; run by ezmlm Delivered-To: mailing list quickcam-drivers@crynwr.com Date: Thu, 4 Mar 1999 08:13:23 +1100 (EST) From: duncan hall <duncan at mail.fim.com.au> To: Pascal Roulin <pascal at le-shop.ch> cc: Rex Johnson <rexjohns at bellatlantic.net>, quickcam-drivers at crynwr.com Subject: Re: Web Page Doesn't Refresh MIME-Version: 1.0 Netscape has a very heavy cache.To over come this you could use nph push technology (probably not an option), an applet (lots of free ones out there) to display the image or write a perl script that would change the name of the image each time it is displayed. The applet is probably the easiest way to go. I'm running two cam on my site both are displayed via a simple ready compiled applet. Dunc http://webcam.fim.com.au
Mailing-List: contact quickcam-drivers-help@crynwr.com; run by ezmlm
Delivered-To: mailing list quickcam-drivers@crynwr.com
X-Sender: barlow at servtech.com
Mime-Version: 1.0
Date: Wed, 03 Mar 1999 16:33:21 -0500
To: quickcam-drivers@crynwr.com
From: Kerry Barlow <admin at mntnweb.com>
Subject: refresh netscape
are you using the meta refresh tag? the example below will refresh every 45
seconds.
this works fine for my webcam and netscape 3.0
<META HTTP-EQUIV="REFRESH" CONTENT="45">
Sincerely
Kerry
<Admin at MntnWeb.Com>
WWW server hosting
Http://mntnweb.com
Binghamton online Webcam Http://MntnWeb.Com/bing.htm
CHRISTMAS Web Page Http://mntnweb.com/xmas.htm
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Delivered-To: mailing list quickcam-drivers@crynwr.com
From: scottrus at us.ibm.com
X-Lotus-FromDomain: IBMUS
To: quickcam-drivers@crynwr.com
Date: Wed, 3 Mar 1999 18:24:24 -0500
Subject: Re: refresh netscape
Mime-Version: 1.0
Here is a DHTML way of refreshing the image that works with both IE 4.x and
NS4.x. This works by tricking the browser cache into thinking the image has
expired. What's nice about it is only the image updates, and there are no
frames involved! The refresh timer is located in the <IMG> tag line and is
currently set for 5 seconds (5000).
You all are talking about sexy solutions and I think this takes top honors
in that area!
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="description" CONTENT="mirage webcam">
<META NAME="keywords" CONTENT="cam mirage webcam rtp">
<META NAME="distribution" CONTENT="global">
<TITLE>WebCAM @ sand.raleigh.ibm.com</TITLE>
<SCRIPT LANGUAGE="JavaScript">
<!--
ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false
function reloadImg() {
// If you change the DIV nesting be sure to update the NS4 vars in
BOTH places.
uniq = new Date();
uniq = "?"+uniq.getTime();
if (ie4) newImage = document.all.imgToLoad.src;
if (ns4) newImage = document.imgToLoad.src;
index = newImage.indexOf("?", 0);
if (index > 0) newImage = newImage.substr(0, index);
if (ie4) document.all.imgToLoad.src = newImage+uniq;
if (ns4) document.imgToLoad.src = newImage+uniq;
}
//-->
</SCRIPT>
</HEAD>
<BODY TEXT="#777777" BGCOLOR="#FFFFFF" LINK="#996600" VLINK="#777777" >
<TABLE BORDER=3 WIDTH=320 HEIGHT=240 CELLPADDING=0 CELLSPACING=0><TR><TD>
<IMG SRC="mycam.jpg" HEIGHT="240" WIDTH="320" NAME="imgToLoad"
ONLOAD="setTimeout("reloadImg()", 5000)">
</TD></TR></TABLE>
</BODY>
</HTML>
Regards,
-- Scott Russell
Mailing-List: contact quickcam-drivers-help@crynwr.com; run by ezmlm
Delivered-To: mailing list quickcam-drivers@crynwr.com
Date: Thu, 04 Mar 1999 17:15:49 +1100
From: "Alastair Edgington" <alastair at netscape.com>
Organization: Netscape Communications
X-Accept-Language: en
MIME-Version: 1.0
CC: Kerry Barlow <admin at mntnweb.com>, quickcam-drivers@crynwr.com
Subject: Re: refresh netscape
Hi All,
if you go to http://home.netscape.com/fishcam/
and go to 'The Continually Refreshing Fishcam' and 'Find out more about how this
page works' there's a tutorial on refreshing images etc. which you might find
handy.
Regs,
Alastair
Mailing-List: contact quickcam-drivers-help@crynwr.com; run by ezmlm
Delivered-To: mailing list quickcam-drivers@crynwr.com
X-Sender: cary at www.rdrop.com
Mime-Version: 1.0
Date: Fri, 4 Jun 1999 13:35:08 -0500
To: quickcam-drivers@crynwr.com
From: David Cary <d.cary at ieee.org>
Subject: Re: (OFF TOPIC) Webcam
I'm trying to assemble a web page to answer just this sort of question.
WebCam technology
http://www.rdrop.com/~cary/html/webcam.html
I've run into exactly this problem, and I haven't really found a
satisfactory solution. Here are some ideas:
* put a question mark ("?") somewhere in the name of the image. Nobody
(should) cache URIs that include question marks. (Unfortunately, some web
servers don't allow that symbol in file names).
* make the IMG tag point to a CGI script (rather than directly at the .gif
file) that just spits out a header with the "refresh" tag, followed by a
copy of the image file. (If it used the the "expires" tag instead, would
that work ?)
(I think I have a CGI script that does this somewhere; do you want it ?)
* Change not only the data in the image file, but also its name. Every
time you capture a new image, increment the file name, write the data to
that new file name, and adjust the IMG tag in your HTML file to point to
this new file. Optionally delete the old image. (Then hitting the refresh
button, or executing the "refresh" command in http header or the HEAD /HEAD
header, loads in the modified HTML file *and* the new picture).
>From: Chris <chrismar at readington.com>
>To: quickcam-drivers@crynwr.com
>Subject: (OFF TOPIC) Webcam
>Webpage: http://www.weirdo.net/
...
>When someone views the web
>page than contains these images they would probably want to reload the
>page every 2 mins (or wait for the automatic refresh) to get the newest
>image. If I go to the page and reload I get the older cached image, not
>the new current image.
>
>Is there a way that I can make netscape reload the new image, even if it
>thinks it has it chached? There's got to be some way to do it, w/out
>turning the cache off in netscape.
--
David Cary "mailto:d.cary@ieee.org" "icbmto:N36 08.830' W97 03.443'"
http://www.rdrop.com/~cary/
Future Tech, Unknowns, machine vision ><> <*> O-
X-MX-Masquarade: Passed MX vaio.on-the-road.webweaving.org at Vaio / WebWeaving
X-No-Spam: Neither the originator(s) address(es) nor the
Receipient(s) addresses are to be used for unsolicited
commercial email (spam) as a per message fee is
incurred for both inbound and outbound traffic
Date: Sun, 6 Jun 1999 08:41:33 -0700 (PDT)
From: Dirk-Willem van Gulik <dirkx at webweaving.org>
X-Sender: dirkx at vaio.ispra.webweaving.org
To: David Cary <d.cary at ieee.org>
cc: quickcam-drivers@crynwr.com
Subject: Re: (OFF TOPIC) Webcam
On Fri, 4 Jun 1999, David Cary wrote:
> * put a question mark ("?") somewhere in the name of the image. Nobody
> (should) cache URIs that include question marks. (Unfortunately, some web
> servers don't allow that symbol in file names).
That is a rather bold statment :-)
> * make the IMG tag point to a CGI script (rather than directly at the .gif
> file) that just spits out a header with the "refresh" tag, followed by a
> copy of the image file. (If it used the the "expires" tag instead, would
> that work ?)
> (I think I have a CGI script that does this somewhere; do you want it ?)
> * Change not only the data in the image file, but also its name. Every
> time you capture a new image, increment the file name, write the data to
> that new file name, and adjust the IMG tag in your HTML file to point to
> this new file. Optionally delete the old image. (Then hitting the refresh
> button, or executing the "refresh" command in http header or the HEAD /HEAD
> header, loads in the modified HTML file *and* the new picture).
Have a look at the HTTP/1.0 or HTTP/1.1 spec. In short, if you use
a no-cache and/or expire header you will be just fine. Though you
might get away with your first two hints; that is more coincidence
than anything else.
If you are really worried and want to bust caches, us a random URI :-) An
easy trick is some-path/to/your/cgiscript.pl/some/random/text/12314
Dw.
Q: What are some other ways to stream digital video media from a URL in a browser?
A: There are 3rd party plugins and (Windows) ActiveX controls that support digital video streaming from a URL. For example, you can use Apple's QuickTime 4 plugin or the RealVideo player, etc. embedded in your HTML page, outside of and instead of playing the video in an embedded Shockwave 7 movie.
Streaming Media World: Media Player Reviews & Streaming Video, Audio, & MP3 Informationhttp://www.streamingmediaworld.com/ [FIXME: read]
Encoding hardware & streaming media services for Internet broadcastinghttp://www.neuronbroadcasting.com/
streaming video and audio ... in three formats -- VivoActive, Real Video and Microsoft NetShow.
How do you plan for and deliver streaming video applications ...?http://www.cren.net/know/techtalk/events/streaming.html
eSensual Studios: webcam software, webcam reviews, streaming video software, video server, free fonts, netcam software, webcam hostinghttp://www.esensualstudios.com/links.php
Windows98:
C:\WIN98SE\Temporary Internet Files\Content.IE5\D9LWODKU\SnPlayer[1].cab C:\WIN98SE\Temporary Internet Files\Content.IE5\SLE7K1QN\SnConfig[1].cab
Removing ActiveX controls is not simply a matter of deleting the Awswax.ocx. ActiveX controls are registered in the System Registry and the system will still assume that the control is available after you delete the file.and gives detailed, step-by-step instructions on uninstalling an ActiveX control.
ActiveX controls, formerly known as OLE controls or OCX controls, ...
[is there a better place for this information ?]
Windows Multimedia System ... Where to get C Source Code for an H.263 Video Encoder or Decoder? ... Where to get C Source Code for an MPEG Video Encoder or Decoder? ... Where to get C/C++ Source Code for Wavelet Image Compression? ... Where to get an Explanation of Color, Color Spaces, Gamma, and All That ...
[FIXME: move to inf_faq]
... Setup Information or INF Files ...
VirtualDub is a video capture/processing utility for 32-bit Windows platforms (98/NT/2000/XP), licensed under the GNU General Public License (GPL). It lacks the editing power of a general-purpose editor such as Adobe Premiere, but is streamlined for fast linear operations over video. It has batch-processing capabilities for processing large numbers of files and can be extended with third-party video filters. VirtualDub is mainly geared toward processing AVI files, although it can read (not write) MPEG-1 and also handle sets of BMP images.
-- Avery Lee http://virtualdub.org/
Note. Some user agents support the use of META to refresh the current page after a specified number of seconds, with the option of replacing it by a different URI. Authors should not use this technique to forward users to different pages, as this makes the page inaccessible to some users. Instead, automatic page forwarding should be done using server-side redirects.http://www.w3.org/TR/html4/struct/global.html#h-7.4.4
URL: http://www.rdrop.com/~cary/html/webcam.html
Send comments, suggestions, bug reports to
David Cary
d.cary@ieee.org.