change_lrc_offset.py 5 heal_the_world.lrc will update the karaoke lyrics adding a 5 second delay

change_lrc_offset.py

#!/usr/bin/python
import re
import sys

def offset(line, add_seconds):
    m = re.match("^\[(\d\d):(\d\d)(?:\.\d\d)?\](.*)$", line)
    if m:
        (r_min, r_sec, lyrics) = m.groups()
        minutes = int(r_min)
        seconds = int(r_sec)
        seconds += add_seconds
        minutes += seconds / 60
        seconds = seconds % 60
        return "[%02d:%02d] %s" % (minutes, seconds, lyrics)
    else:
        return line
        

def main(argv):
    seconds = int(argv[1])
    output = "%s_%d.lrc" % (argv[2][0:-4], seconds)
    print("Adjusting %s by %d seconds and placing output in %s" % (argv[2], seconds, output))
    lrc = open(argv[2], 'r')
    new_lrc = open(output, 'w')
    line = lrc.readline()
    while line:
        new_lrc.write("%s\n" % offset(line, seconds))
        line = lrc.readline()
    lrc.close()
    new_lrc.close()

if __name__ == '__main__':
    if len(sys.argv) == 3:
        main(sys.argv)
    else:
        print("USAGE: %s 3 some_song.lrc\n\tWill change the offset by 3 Seconds")