srt_content = [] for i, block in enumerate(lines, start=1): # Assume format: [00:00:01] Text here match = re.match(r'\[(.*?)\]\s*(.*)', block, re.DOTALL) if match: timestamp, text = match.groups() # Convert [HH:MM:SS] to HH:MM:SS,000 start = timestamp + ',000' # For demo, set duration to 3 seconds end = '00:00:04,000' srt_content.append(f"i\nstart --> end\ntext\n")