I need to view the live screen of my Android mobile on a Windows PC. My Android phone has a mini-HDMI output. Is there any adapter/software that helps me to achieve this? The applications that I found after searching needs the device to be rooted to control it. I don't want to remotely control the device. I just need to get the live feed from the mobile.
To use the HDMI port, you'd need something that can accept HDMI input.
Very few computers can do so (except possibly some smart-tv type boxes).
However, there's a good chance that the monitor connected to your computer can. It might even have a spare input.
In other words, displaying your phone's output "in a window" on your monitor is extremely difficult. But by pushing a button or swapping a cable, you may well be able to display your phone's output on the entire monitor, in place of the computer's.
Practically speaking, if you need it in a window, or the device doesn't have HDMI out, the most common solution seems to be a high-end webcam in a fixture to aim it at the device. I saw a presentation that was delivered this way, displaying on very large flatscreen TVs, and didn't even realize that the slides were coming from an Android tablet as seen by an overhead camera until the presenter picked up the tablet and slid a phone into it's place.