#!/usr/bin/env python2 import sys, zmq, cmd 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 'Sending command:[%s]' % cmd        self.requester.send(cmd)        message = self.requester.recv()        print 'Received reply:[%s]' % 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