import subprocessimport osimport timedef getTime(flvpath,fid):   #file_str = ‘1.flv‘   file_str = flvpath   wg = subprocess.Popen([‘ffmpeg.exe‘, ‘-i‘, file_str], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)   (standardout, junk) = wg.communicate()   ans = str(standardout)   num = ans.find("Duration:")   out = ans[num+10:num+18]   fid.write(file_str + "<| time is |>" + out)   fid.write("\r\n")def getFileName(path, warp):   #f_list = os.listdir(path)   #rootdir = os.getcwd()   rootdir = path   logname = warp[1:] + ‘_log.txt‘   fid = open(logname, ‘w‘)   for (dirpath, dirnames, filenames) in os.walk(rootdir):       for filename in filenames:           pathname = os.path.join(dirpath, filename)           if os.path.splitext(pathname)[1].lower() == warp:              getTime(pathname,fid)   fid.close()if __name__ == "__main__":   print("Begin time: " + time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()))   rootdir = "D:\\mooc\\视频资料"   warp = ".flv"   getFileName(rootdir, warp)   warp = ".mp4"   getFileName(rootdir, warp)   print("End time:" + time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()))