FFMPEG's zmqshell.py except it works with python3

zmqshell3.py

#!/usr/bin/env python3

###############################################################################
# you'll need to install pyzmq via `pip install pyzmq`
###############################################################################

import cmd
import sys

import zmq


class LavfiCmd(cmd.Cmd):
    prompt = "lavfi> "

    def __init__(self, bind_address):
        context = zmq.Context()
        self.requester = context.socket(zmq.REQ)
        self.requester.connect(bind_address)
        cmd.Cmd.__init__(self)

    def onecmd(self, cmd):
        if cmd == "EOF":
            sys.exit(0)
        print(f"Sending command: {cmd}")
        self.requester.send_string(cmd)
        message = self.requester.recv()
        print(f"Received reply: {message}")


try:
    bind_address = sys.argv[1] if len(sys.argv) > 1 else "tcp://localhost:5555"
    LavfiCmd(bind_address).cmdloop("FFmpeg libavfilter interactive shell")
except KeyboardInterrupt:
    pass