What are the current controllers / microprocessors for the development of embedded systems?

Question

linux

Interested in choosing in favor of a specific manufacturer of microprocessors, controllers, on the basis of which it is somehow possible to implement the following range of tasks or having the following functions:

• Whether the controller or the daughter board of the controller has analog/digital inputs/outputs
  
• Ability to connect to the controller via Ethernet
  
• Linux support
  
• Video processing capability
  

They are not interested in the most affordable Open Source/Hardware solutions, but in commercial products from automation industry leaders with their own R&D and at least some technical support.
The programming language is not important.

Answer 1

you have requirements for a general-purpose processor, and just all sorts of arduins and raspberry pi will be the leaders here.
and so industrial boards with general-purpose processors are made by the same supermicro.

Answer 2

For video processing, is it better to take a board with a DSP (DSP)
Arduino-like DSP board?
Search: dsp board linux
From well-known manufacturers: Texas Instruments, Freescale Semiconductors, etc.