Viewerframe Mode Refresh Top -
Users could even add the &Interval= parameter to the URL to control the refresh rate, like http://[camera_IP]/ViewerFrame?Mode=Refresh&Interval=5 for a new image every 5 seconds.
Mastering Viewerframe Mode: How to Optimize and Refresh the Top View
| Scenario | Benefit of "Refresh Top" | |----------|--------------------------| | Browsing multi-page documents | Always start at top of each new page | | Photo editing workflow | See full image after zoom reset | | CAD or technical drawings | Consistent reference point | | Reading long vertical images | Avoid getting lost in middle of image |
// "Mode" logic: Switch to performance mode temporarily if (this.mode === 'performance') this.renderer.setPixelRatio(1); // Lower resolution for speed viewerframe mode refresh top
In legacy web development and certain IP camera interfaces (like those built on Java applets or ActiveX), a refresh command can target different layers of the page window.
This is an explicit instruction passed via JavaScript or URL parameters telling the application to refresh the topmost window ( window.top ) rather than just the isolated frame.
Ideal for remote locations where high-speed internet is unavailable. Users could even add the &Interval= parameter to
Issuing a viewerframe mode refresh top forces the decoder to drop non-reference (B/P) frames and jump to the next Instantaneous Decoder Refresh (IDR) frame—the "top" of the GOP (Group of Pictures).
If the "top" page contains the viewerframe, and the viewerframe tells the "top" to refresh, you can accidentally create a loop.
setInterval(function() $("#viewer-top").load(window.location.href + " #viewer-top"); , 3000); Implementation Tip Ideal for remote locations where high-speed internet is
ensures that the link loads in the full window, replacing any frames. JavaScript Method : Developers use window.top.location.reload()
Refreshing the top viewport layer can cause CPU bottlenecks if done inefficiently. Use these strategies to keep your frames smooth: Implement Dirty Region Rendering