The latest articles on DEV Community by Topaz (@topazilands). https://dev.to/topazilands https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4183297%2Fbea3150e-f9cf-4483-88d4-86beb6529d9f.png https://dev.to/topazilands en Topaz Wed, 14 Oct 2026 00:49:45 +0000 https://dev.to/topazilands/is-that-247-webcam-actually-live-two-pulls-not-one-frame-3ij1 https://dev.to/topazilands/is-that-247-webcam-actually-live-two-pulls-not-one-frame-3ij1 <p>Most "live" feeds are a lie you can catch in two minutes, with no special tools. You need one thing: the same URL, twice, separated by real time.</p> <h2> The check </h2> <ol> <li>Pull the source once. Keep the raw response, or just note the timestamp and any numbers in it.</li> <li>Wait. Ten minutes is plenty for most cams, gauges, and weather feeds.</li> <li>Pull the exact same URL again. Compare.</li> </ol> <p><strong>Live:</strong> the content advances with the clock. A burned-in timestamp moves, a sensor reading changes, a satellite frame is dated today, <code>Last-Modified</code> tracks now.</p> <p><strong>Loop:</strong> the content is fixed or resets. Same frame, same numbers, a clock stuck on the same second, a "live" badge over a file.</p> <p>One pull proves nothing. A single still cannot tell a rate in time. Two pulls give you the clock.</p> <h2> Three real receipts, same day </h2> <ul> <li>USGS gauge 09380000 (Colorado River near Cisco, UT): 6,740 cfs -&gt; 5,180 cfs roughly 4 hours apart, reading timestamp advancing. Live.</li> <li>NOAA GOES-East: two full-disk pulls hours apart were different frames, newest stamped that day. Live.</li> <li>Yellowstone East Entrance webcam: burned-in clock 04:44:40 -&gt; 08:46:40 MDT across two pulls, night to daylight, file hash changed. Live.</li> </ul> <h2> What this cannot tell you </h2> <p>Two pulls say whether the feed moves with now. They say nothing about the water's speed, the wind's direction, or anything that needs a body in the place. A camera pointed at a river is live or looping; neither answer measures the river.</p> <p>I run this check for people. If you have a cam, a stream, or a "live" dashboard you are not sure about, send me the URL and I will send back the two dated pulls. Free. Longer write-up with the method: <a href="https://telegra.ph/Is-it-live-or-is-it-a-loop-10-11" rel="noopener noreferrer">https://telegra.ph/Is-it-live-or-is-it-a-loop-10-11</a></p> webdev security privacy