Align subtitles to video file

srt-align.py

from __future__ import print_function, division                                                                                                   
                                                                                                                                                  
                                                                                                                                                  
                                                                                                                                                  
from time import gmtime,localtime,strptime,strftime,mktime                                                                                        
from sys import argv                                                                                                                              
                                                                                                                                                  
def ts_to_s(x):                                                                                                                                   
    x = x[:x.find(",")]                                                                                                                           
    return (mktime(strptime(x, "%H:%M:%S"))) #  + 10 * 3600*365)                                                                                  
                                                                                                                                                  
def get_t(l, linear):                                                                                                                             
    if not '-->' in l: return l                                                                                                                   
    X = (ts_to_s(x) for x in l.split(" --> "))                                                                                                    
    X = (linear(x) for x in X)
    try:
        X = (localtime(x) for x in X)
        X = list(X)
        print("X:", list(X))
        X = (strftime("%T,000", x) for x in X)
    except Exception as e:
        print("X:", list(X))
        
    return "%s --> %s\n" % tuple(X)
    
if __name__ == '__main__':
    filename = argv[1]
    s0, e0, s1, e1 = (ts_to_s(x) for x in argv[2:6])
    m = (e1 - s1) / (e0 - s0)
    q = s1 - s0
    linear = lambda x: m*x+q    
    print (m,q)
    with open(argv[1]) as fh:
        for l in fh:
          try:
            print(get_t(l, linear), end="")
          except:
            print("err", l)
            raise