script to merge two subtitles

####save the file to disk name it mergesubtitle.py

#!/usr/bin/python
import re
import sys
import collections
from datetime import datetime as time


def converttodict(srtfile):
    eng = open(srtfile,"r").read()

    englist = eng.split("\r\n\r\n")
    y = []
    y.append(eng)
    print len(englist)
    timelist =[]
    dict1 = {}
    for i in englist:
        if i == "":
            continue
        il = i.split("\r\n")
        timing = il[1].split(" --> ")
        getnum = re.search(r"\d+", il[0])
        starttime = time.strptime(timing[0], "%H:%M:%S,%f")
        timelist.append(starttime)
        dict1[starttime] = {}
        dict1[starttime]['time'] = il[1]
        dict1[starttime]['content'] = il[2:]

    return dict1

def formatoutput(dict1):
    n = 1
    content =""
    for i in dict1:
        l1 = str(n) + "\r\n"
        l2 = dict1[i]['time'] + "\r\n"
        l3 = "\r\n".join(dict1[i]['content']) + "\r\n"
        l4 = "\r\n"
        lall = l1 + l2 + l3 + l4
        content  += lall
        n += 1
   
    return content

def writefile(filename, content):
    ofile = open(filename,"w")
    ofile.write(content)
    ofile.close()


def mergesubtitle(dict1,dict2, filename):
    for i in dict1:
        if i in dict2.keys():
            dict1[i]['content'] +=dict2[i]['content']
            del dict2[i]

    newdict = dict1.copy()
    newdict.update(dict2)
    sorteddict = collections.OrderedDict(sorted(newdict.items()))
    content = formatoutput(sorteddict)

    writefile(filename, content)


srt1 = sys.argv[1]
srt2 = sys.argv[2]
filename = sys.argv[3]

dict1 = converttodict(srt1)
dict2 = converttodict(srt2)

mergesubtitle(dict1, dict2, filename)


1- usage
$ python mergesubtitle.py subtitle1.srt subtitle2.srt output.srt

2- if you merge subtitle that is not latin, if you use vlc
vlc -> preferences -> input / Codec --> Subtitle codecs --> subtitles

then choose your language