#!/usr/bin/env python

import multiprocessing
import subprocess
import os

def x():
    fn = '/tmp/somevideo.avi'
    p = subprocess.Popen('mplayer -identify -frames 0 ' + fn, shell=True,
    #p = subprocess.Popen(['mplayer', '-identify', '-frames', '0', fn], shell=False,
                         stderr=subprocess.PIPE, stdout=subprocess.PIPE)
    stdout, stderr = p.communicate('')

os.system('stty -a > 1.txt')
processes = []
for i in xrange(2):
    p = multiprocessing.Process(target=x)
    p.start()
    processes.append(p)

for p in processes:
    p.join()

os.system('stty -a > 2.txt')
os.system('diff 1.txt 2.txt')