I was watching a series and had to shift my subtitles by 38 seconds every time I open a video. After a few times of pain, I ended up writing a script to cut the crap, have some fun, and get a bit into NodeJS file I/O! 😀
It only deals with subtitle files of *.ASS extension. `delay_ass.js` being the NodeJS script file, you can use it like:
$ node delay_ass.js example.ass -32
Grab it here:
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| // USAGE: | |
| // node delay_ass.js subtitle.ass -32 | |
| const fs = require('fs'); | |
| const fileName = process.argv[2]; | |
| const delaySeconds = process.argv[3]; | |
| const encoding = process.argv[4] || 'utf16le'; | |
| if (typeof delaySeconds === 'undefined') { | |
| console.log( | |
| 'Error: Please provide a number after file name for seconds to delay, e.g.:' | |
| ); | |
| console.log('$ node delay_ass.js S02E01.ass -12.5'); | |
| return; | |
| } | |
| const isDelay = !delaySeconds.startsWith('-'); | |
| const adjective = isDelay ? 'later' : 'earlier'; | |
| fs.readFile(fileName, encoding, (err, data) => { | |
| if (err) return console.log(err); | |
| const dataLines = data.split(/\n/); | |
| const newLines = dataLines.map(line => { | |
| if (line.startsWith('Dialogue:')) { | |
| return processLine(line); | |
| } else { | |
| return line; | |
| } | |
| }); | |
| const newData = newLines.join('\n'); | |
| fs.writeFile(fileName, newData, encoding, err => { | |
| if (err) return console.log(err); | |
| console.log( | |
| 'Successfully made subtitle appear ', | |
| adjective, | |
| 'by', | |
| delaySeconds, | |
| 'seconds.' | |
| ); | |
| }); | |
| }); | |
| function processLine(line) { | |
| const blocks = line.split(/,/); | |
| const newBlocks = blocks.map((block, i) => { | |
| if (i === 1 || i === 2) { | |
| return delayTimestamp(block); | |
| } else { | |
| return block; | |
| } | |
| }); | |
| return newBlocks.join(','); | |
| } | |
| function delayTimestamp(time, delayStr = delaySeconds) { | |
| // E.G. 0:14:12.04 | |
| const timeArr = time.split(/:/).map(e => parseFloat(e, 10)); | |
| const [h, m, s] = timeArr; | |
| const totalS = s + 60 * m + 3600 * h; | |
| const delay = parseFloat(delayStr, 10); | |
| const newTotalS = totalS + delay; | |
| const newH = Math.max(0, Math.floor(newTotalS / 3600)); | |
| const newM = Math.max(0, Math.floor((newTotalS % 3600) / 60)); | |
| const newS = Math.max(0, newTotalS % 60); | |
| const newTime = [newH, newM, newS.toFixed(2)].join(':'); | |
| return newTime; | |
| } |
