1. With Dahua camera working on Dahua DVR, right click live view select PTZ control.
2. Click the “+” iris, which should bring up the OSD (on screen display) menu.
3. Use the directional buttons to navigate to Advanced and click iris "+".
4. Navigate to "Video Type" and use the directional buttons to select a different video mode.
(If camera is going onto a Viper use TVI).
5. Click iris "+" to select the new video mode and again to confirm it.