格式化并合并多个子句到一个整句。需要安装python3，运行方式：`python format_srt.py your_srt_file.srt`

format_srt.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import argparse

OUT_FILE = 'output.srt'

def run(srt_file):
    LineList = []
    timestamp_line = False
    with open(srt_file, 'r',encoding="utf-8") as srtfile:
        for line in srtfile:
            if len(line) > 4:
                # remove audio only subtitles
                line = line.replace('{\\an8}', '').replace('."', '".')
                # remove audio only subtitles
                if '[' in line and ']' in line:
                    continue
                if '-->' in line:
                    # remove time range only subtitles
                    if timestamp_line:
                        LineList.pop(-1)
                    timestamp_line = True
                else:
                    # merge lines that are broken up into multilines
                    if not timestamp_line:
                        LineList[-1] += ' ' + line.strip()
                        continue
                    timestamp_line = False
                LineList.append(line.rstrip())

    results = []
    clauses = []
    lineNum = 1
    time_range_start = None
    time_range_end = None
    for line in LineList:
        if ' --> ' in line:
            start, end = line.split(' --> ')
            if time_range_start is None:
                time_range_start = start
            time_range_end = end
            continue
        clauses.append(line)
        if line.endswith('.') or line.endswith('?') or line.endswith('!'):
            time_range = time_range_start + ' --> ' + time_range_end
            time_range_start = None
            time_range_end = None
            results.append(str(lineNum))
            results.append(time_range)
            results.append(' '.join(clauses))
            results.append('')
            lineNum += 1
            clauses = []

    with open(OUT_FILE, 'w', encoding="utf-8") as srtfileout:
        srtfileout.write('\n'.join(results))

    print('Formatted srt file is saved to "{}"'.format(OUT_FILE))

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('srt_file', help='the srt file to format')
    args = parser.parse_args()

    run(args.srt_file)