Utilizing external IR illumination with 940 nm provides the benefit of covert surveillance. IR light at 940 nm is almost invisible to the human eye, making it ideal for discreet monitoring without drawing attention to the presence of the camera. This allows for effective surveillance while remaining undetected by intruders. Axis Communications' product documentation on IR illumination confirms this advantage of 940 nm IR light.

The ONVIF (Open Network Video Interface Forum) standard provides several benefits to end users. One key benefit is that it helps create future-proof systems and more secure investments by ensuring interoperability between different manufacturers' devices, which protects against obsolescence. Additionally, ONVIF increases flexibility and offers greater freedom of choice, allowing users to mix and match devices from different vendors, thereby tailoring their security systems to specific needs without being locked into a single manufacturer's ecosystem.
References: Axis Communications ONVIF Conformance Documentation and ONVIF.org Benefits of ONVIF.

Deinterlacing in video encoding is used to eliminate the artifacts that occur when the two fields of an interlaced video frame capture different moments in time. These artifacts, known as tearing effects, can be particularly noticeable when there is motion in the scene. Deinterlacing processes the fields to produce a single frame, resulting in a smoother image with reduced tearing. [Reference: Axis Communications - Video Processing Techniques]