reformat_youtube_subtitles.py

# Takes text with the format:
#
#   00:05
#   Some subtitles
#   00:12
#   Some more text
#   ...
#
#   61:20
#   More subtitle at 61 minutes, 20 seconds
#
# And groups it into `seconds_bucket` groups, for example:
#
#   00:05
#   Some subtitles Some more text
#   ...
#

seconds_bucket = 60

with open("file.txt", "r") as f:
  text = f.read()

lines = text.split("\n")
lines_with_times = []

def time_in_seconds(time):
  [minutes, seconds] = time.split(":")
  return int(minutes) * 60 + int(seconds)

def seconds_in_time(seconds):
  seconds_remaining = seconds % 60
  minutes = int((seconds - seconds_remaining) / 60)
  return "{}:{}".format(str(minutes).zfill(2), str(seconds_remaining).zfill(2))

for (i, line) in enumerate(lines):
  if (i % 2 == 0):
    seconds = time_in_seconds(lines[i])
    lines_with_times.append((seconds, lines[i + 1]))

current_bucket = -1

grouped_lines = []
for line in lines_with_times:
  if (line[0] > current_bucket):
    current_bucket += seconds_bucket
    grouped_lines.append([line[0], line[1]])
  else:
    last = len(grouped_lines) - 1
    grouped_lines[last][1] += " " + line[1]

for group in grouped_lines:
  print(seconds_in_time(group[0]) + "\n" + group[1])