IP CCTV client for Raspberry Pi

Software development is required to watch HTTP/RTSP streaming video on the Raspberry Pi platform or Android TV stick (hereinafter the device)
Task:
There are 20 different IP cameras, SD and HD quality
All cameras support either h264 or MJPEG streaming.
Some people keep the sound.
The device must connect to the network and via HDMI connect to the TV / projector / HDMI matrix. The video output is set as a 1080p60 2 channel PCM constant. All automatic video settings, HDCP and attempts to determine the TV EDID are completely disabled
The device must have a web server that accepts commands such as /do?show1cam=cam01
When the camera 01 is commanded to display, the device begins to display the flow on a black background on the entire screen, taking into account the flow proportions.
The device must have a settings file, in which the addresses of the cameras are written in manual, for example.
Cam01
[type = rtsp]
URL=rtps://xxxxx
Cam02
[type=http]
URL=http://yyyy

The device also supports groups of cameras, for simultaneous display on the screen in the form of squares.
Group01
[Cams=4]
1=cam01
2=cam08
3=cam15
4=cam03
Group02
[Cams=16]
1=xx)

The device must be stable, disable all unnecessary services/programs/auto updates, and so on.
Delivery method to the customer – an image of the SD card disk in the case of Raspberry Pi or firmware for Android stick.