应急使用，合并两个中英 srt 字幕为上中下英双语，使用字幕组的 ass 样式。两个字幕在不同的 layer 所以允许保留各自的时间，不需要人工调整。先 npm install subtitles-parser

concat-srt.js

const path = require('path')
const fs = require('fs')
const subParser = require('subtitles-parser')
/* eslint-disable no-tabs */

var args = process.argv.slice(2)
if (args.length < 2) {
  error('Need Two Files')
} else {
  let chs
  let eng

  if (/eng$/i.test(path.parse(args[0]).name)) {
    eng = readSrt(args[0])
    chs = readSrt(args[1])
  } else if (/eng$/i.test(path.parse(args[1]).name)) {
    chs = readSrt(args[0])
    eng = readSrt(args[1])
  }

  if (typeof eng === 'undefined') {
    let data = readSrt(args[0])
    if (containChinese(data[0].text)) {
      chs = data
      eng = readSrt(args[1])
    } else {
      eng = data
      chs = readSrt(args[1])
    }
  }

  let result = [
    '[Script Info]',
    'Title:CRIMX',
    'Original Script:CRIMX',
    'Synch Point:1',
    'ScriptType:v4.00+',
    'Collisions:Normal',
    'Timer:100.0000',
    '',
    '[V4+ Styles]',
    'Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding',
    'Style: Default,方正黑体简体,20,&H00FFFFFF,&HF0000000,&H00000000,&H32000000,0,0,0,0,100,100,0,0.00,1,2,1,2,5,5,6,134',
    '',
    '[Events]',
    'Format: Layer, Start, End, Style, Actor, MarginL, MarginR, MarginV, Effect, Text'
  ].join('\n')

  result +=
  // chs subs
  chs.map(sub => {
    var start = sub.startTime.replace(/,/g, '.').match(/\d:\d{2}:\d{2}.\d{2}/)[0]
    var end = sub.endTime.replace(/,/g, '.').match(/\d:\d{2}:\d{2}.\d{2}/)[0]
    return `Dialogue: 0,${start},${end},*Default,NTP,0000,0000,0000,,${sub.text.replace(/\n/g, ' ')}\\N{\\fn方正黑体简体}{\\fs10}{\\bord1}{\\shad1}{\\b0}{\\c&HFFFFFF&}{\\3c&H111111&}{\\4c&H111111&} \\N`
  }).join('\n') +
  '\n' +
  // eng subs
  eng.map(sub => {
    var start = sub.startTime.replace(/,/g, '.').match(/\d:\d{2}:\d{2}.\d{2}/)[0]
    var end = sub.endTime.replace(/,/g, '.').match(/\d:\d{2}:\d{2}.\d{2}/)[0]
    return `Dialogue: 1,${start},${end},*Default,NTP,0000,0000,0000,, \\N{\\fn方正黑体简体}{\\fs10}{\\bord1}{\\shad1}{\\b0}{\\c&HFFFFFF&}{\\3c&H111111&}{\\4c&H111111&}${sub.text.replace(/\n/g, ' ')}`
  }).join('\n')

  let encode = 'utf8'
  // windows uses utf16le with BOM
  if (/^win/i.test(process.platform)) {
    result = '\ufeff' + result.replace(/\n/g, '\r\n')
    encode = 'utf16le'
  }

  fs.writeFileSync(`${path.parse(args[0]).name.replace(/[.-_](eng|chs)$/i, '.chs&eng')}.ass`, result, encode)
}

function readSrt (path) {
  var buffer = fs.readFileSync(path)
  var result = subParser.fromSrt(buffer.toString())
  if (result.length <= 0) {
    result = subParser.fromSrt(buffer.toString('utf8'))
    if (result.length <= 0) {
      result = subParser.fromSrt(buffer.toString('utf16le'))
      if (result.length <= 0) {
        error(`Cannot read file ${path}`)
      }
    }
  }
  return result
}

function containChinese (str) {
  return /[\u4e00-\u9fa5]/.test(str)
}

function error (message) {
  console.error(message)
}

Drag&Drop.cmd

node %~dp0\index.js %*