no coding= option fo subprocess.Popen()

[snippsat]

Have you looked at doc?
See parameter encoding=None setting to encoding='utf-8' stdout will by string(Unicode default) Python 3.

Work in run() to which should be used in all cases it can handle.

The recommended approach to invoking subprocesses is to use the run() function for all use cases it can handle.
For more advanced use cases, the underlying Popen interface can be used directly.

import subprocess
 
output = subprocess.run(['ping', '-n', '4', 'google.com'], encoding='utf-8', capture_output=True)
print(output.stdout)

Output:
Pinging google.com [2a00:1450:400f:80b::200e] with 32 bytes of data:
Reply from 2a00:1450:400f:80b::200e: time=42ms 
Reply from 2a00:1450:400f:80b::200e: time=33ms 
Reply from 2a00:1450:400f:80b::200e: time=46ms 
Reply from 2a00:1450:400f:80b::200e: time=50ms 

Ping statistics for 2a00:1450:400f:80b::200e:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 33ms, Maximum = 50ms, Average = 42ms