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Solved
Webcam Photo not refreshing
Posted on 2011-03-09
We are trying to put a webcam on our website. My page www.downtownrapidcity.com/camera.html is set to refresh every 5 seconds which it does. But the photo doesn't change from the webcam. I have to manually click on Refresh on my browser window to get the image to change.
If you go to http://208.117.100.102/cgi-bin/viewer/video.jpg where it is pulling the photo, it updates with each refresh of the page.
How do I get the image to change with each auto refresh?
If you go to http://208.117.100.102/cgi-bin/viewer/video.jpg where it is pulling the photo, it updates with each refresh of the page.
How do I get the image to change with each auto refresh?
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8 Comments
I guess browser is cacheing your image instead of reloading it when page reloads.
Try adding
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Expires" CONTENT="-1">
between HEAD tag.
Try adding
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Expires" CONTENT="-1">
between HEAD tag.
My approach is to add a random tag to the image URL each time it is fetched to bypass caching. Sometimes it is the webcam software itself that does the caching.
<SCRIPT LANGUAGE="JavaScript">
url='http://208.117.100.102/cgi-bin/viewer/video.jpg?v=';
var image1 = new Image();
function RefreshMyCamera()
{
if ( ( image1.src != '' ) && (image1.complete) )
{
document.images['mycamera'].src = image1.src
}
imgno = Math.round(Math.random()*215815);
image1.src = url + imgno;
setTimeout('RefreshMyCamera()', 5000); // inter-frame delay in msec
}
</script>
<img border='0' src='http://208.117.100.102/cgi-bin/viewer/video.jpg' name='mycamera'>
<SCRIPT LANGUAGE="JavaScript">
setTimeout('RefreshMyCamera()', 10);
</SCRIPT>
You video server (camera) appears to be down.
Instead of an image it is returning this:
http://208.117.100.102/cgi-bin/viewer/video.jpg
HTTP/1.1 500 Internal Server Error
Instead of an image it is returning this:
http://208.117.100.102/cgi-bin/viewer/video.jpg
HTTP/1.1 500 Internal Server Error
The javascript approach has the added advantage that only the image is updated, so you can embed it in a static web page and not have to refresh the whole page.
Did we take down your camera server?
Did we take down your camera server?
I don't know. Another company does the camera server I have put in a trouble ticket to them. Thanks... as soon as it is back up I can try these fixes.
Improved version. I have it pointing at my webcam for now. You can change the URL (in two places) and try it with your camera when your server comes back online.
<SCRIPT LANGUAGE="JavaScript">
var url='http://sjklein.dyndns.org:11001/cam_1.jpg?';
var frq=1500; // interval in msec
function PrefetchImage()
{
var imgno = Math.round(Math.random()*215815);
image1 = new Image();
image1.src = url + imgno;
}
var imgno;
var image1;
PrefetchImage();
function RefreshMyCamera()
{
if (image1.complete)
{
document.images['mycamera'].src = image1.src
PrefetchImage();
}
setTimeout('RefreshMyCamera()',frq);
}
</script>
<img border='0' src='http://sjklein.dyndns.org:11001/cam_1.jpg' name='mycamera' width=95%>
<SCRIPT LANGUAGE="JavaScript">
setTimeout('RefreshMyCamera()', 10);
</SCRIPT>
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