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    Alert if webcam image out-of-date

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    Alert if webcam image out-of-date

    Post by sarfend » Sat 03 Sep 2016 6:11 pm

    Hi all,

    I wonder if anyone has any suggestions on this one.

    On my weather site, I have a display of my station data courtesy of Cumulus and the Saratoga PHP scripts. I also used Cumulus to upload a webcam image every 10 minutes.

    It's not uncommon for something to go wrong - either the station stops collecting data, the PC locks.reboots or there's an error, which means my online data is out-of-date. I use a number of solutions to keep everything working (Cumulus Toolbox plus a PHP script that checks all's up to date. Everything works well, and I get email alerts if the weather data is out-of-date. The only thing I can't fix, is the webcam.

    On occasion, the webcam capture software stops. Cumulus dutifully uploads whatever image it can find, so the website reports there's a recently-uploaded image, and the site displays an image.

    Ideally, what I need is for Cumulus to spot that the image has a filestamp of >15 minutes, generate a tag, and I can detect that tag on the site.

    My status page is here: http://www.sarfend.co.uk/weather/status.php - and using a site monitor, I can get an email alert if any errors appear on this page - what I can't do, is identify the age of the local jpg prior to Cumulus uploading it.

    Anyone think of any clever ways around this?



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    Re: Alert if webcam image out-of-date

    Post by beteljuice » Sat 03 Sep 2016 10:05 pm

    Here's something the beteljuice put together many years ago ...

    It uses three different images.
    • Checking Camera Status (loading.jpg - 3 seconds)
      Actual webcam image (cam_1.jpg)
      Off-Line image (offline.jpg)
    It uses both Javascript in the web page and a php script to do the timestamp check.

    Code: Select all

    <!-- web page code -->
    <SCRIPT LANGUAGE="JavaScript">
    function LoadImage1()
            uniq1 = Math.random();
    	document.images.webcam1.src = "opt.php?uniq="+uniq1;
    function StartDelay()
            window.setTimeout("LoadImage1();", 3000); // status image delay
            window.setInterval("LoadImage1();", 30000); // subsequent loop
    function DoIt1()
            window.setTimeout("LoadImage1();", 8000);
    <!-- then where you put the image -->
    <img src="loading.jpg" id="webcam1" name="webcam1" onload="StartDelay()" width=320 height=240 border=1 style="border-color:#a4a4ff; border-style:solid;">
    ... and the php file (opt.php)

    Code: Select all

    // Time to wait for showing the offline image in seconds
    // We don't want cached results
    // Get the time that the uploaded image is on the server
    $calctime=date("U") - filemtime("cam_1.jpg");
    // If the uploaded image exists and its new enough
    if (file_exists("cam_1.jpg") and $calctime<=$offtime){
    } else {
    // Else send the predefined off-line image
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    ......................Imagine, what you will KNOW tomorrow !

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    Re: Alert if webcam image out-of-date

    Post by f4phlyer » Mon 12 Sep 2016 10:01 pm

    Not sure if Beteljuice answered your question but it seems you have more than basic skills. I would think it would be possible to create a script to check the image "metadata" for "create time/date" and compare it to current date, then handle the email the same. There are apps/programs to strip the metadata and put it in a file. Hope this helps
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