Iframe interval on Dahua cameras

Setting i-frame rate to 1 per second is not optimal. It is inefficient and results in larger bitrate than is necessary.

Depends on your use case. That is the preferred/recommended setting for Blue Iris as an example.
 
I run every one of my cameras Iframe = FPS
 
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Hikvision cameras default to FPS = iframe, and I prefer it that way. In the cameras I have from Dahua, it was no longer the default as in the Hikvision cameras, but I changed the configuration so that FPS was the same as iframe.
 
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