Go to .
Main stream refers to the primary stream that affects data recorded to the hard disk drive and will directly determine your recording quality and image size.
Comparing with the sub-stream, the main stream can provide a higher quality video with higher resolution and frame rate.
It refers to the number of frames captured each second. A higher frame rate is advantageous when there is movement in the video stream, as it maintains image quality throughout.
Image resolution is a measure of how much detail a digital image can hold. The greater the resolution, the greater the level of detail. Resolution can be specified as the number of pixel-columns (width) by the number of pixel-rows (height), e.g., 1024 × 768.
The bit rate (in kbit/s or Mbit/s) is often referred to as speed, but actually defines the number of bits/time unit rather than distance/time unit. Two types including variable or constant are available.
H.265+ is an optimized encoding technology based on the standard H.265/HEVC compression. With H.265+, the video quality is almost the same as that of H.265/HEVC but with less transmission bandwidth and storage capacity required.
A higher resolution, frame rate and bit rate setting will offer you better video quality, but it will also require more internet bandwidth and use more storage space on the hard disk drive.
H.265+ encoding technology is only available for certain models.
Sub-stream is a second code that runs alongside the main stream. It allows you to reduce the outgoing internet bandwidth without sacrificing your direct recording quality.
Sub-stream is often exclusively used by apps to view live video. Users with limited internet speeds may benefit most from this setting.