Possible sub-stream resolutions vary with the camera. E.g. a Dahua 5442 has 3 streams that is very nice. Can be configured e.g. to 1 full res., 1 full HD, 1 ~VGA. I love this approach. But for example a non-C Hikvision 2086 has only 720p 3rd stream, and so on. Dahua's full-HD third stream is...