Which IP cameras and software to choose?

Question

CCTV

It is necessary to install cameras in 10 offices with 5 rooms each (50 cameras in total).
For what:
- watch the image online from one of the cameras
- view the recorded video online from one of the cameras, with the ability to select the date / time, with the possibility of accelerated viewing
- the ability to simply select a camera from the list of cameras. Cameras will be purchased of one model, but later there may be other brands / models (if suddenly the manufacturer closes in a few years)

What is not needed:
- view images from several cameras on one monitor
- store video archive in the cloud or on our server (all recorded videos will be on sd on cameras). If we find a convenient solution for the price, then our Internet channel will not be enough for 5 cameras to constantly stream to the Internet
- analog cameras with a registrar. We do not want to bother with laying wires during installation

Technical specs: Software
OS: Windows required, Android / iOS desirable
Cameras: 720p+, PTZ, wifi

Budget:
As cheap as possible :) But to have high-quality reliable cameras.

Please advise inexpensive cameras from an adequate brand, with normal software.

Found a camera on Ali. But I've never heard of this crap.
https://s.click.aliexpress.com/e/9TUsY9y
I would like to hear knowledgeable people who know the nuances and possible pitfalls.

Answer 1

Do not take these - they do not have software for viewing the recorded video.
It is better to look for XM production (they have the most sane software from cheap cameras) - perhaps like these https://ru.aliexpress.com/item/2MP-HD-1080P-PTZ-Wi...
or these https://ru. aliexpress.com/item/Hamrolte-WI-FI-HD10...
Better where specific processors (Hi3518, Hi3516) and sensors (IMX322) are indicated - so you can check if the seller is lying or not