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random-access.js
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random-access.js
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const fs = require('fs')
const devnull = require('dev-null')
const { SubtitleStream } = require('..')
// SubtitleStream intercepts subtitles in an mkv stream and implements seeking support
let subtitleStream = new SubtitleStream()
subtitleStream.once('tracks', (tracks) => {
console.log(tracks)
const offset = 25882901
// close the old subtitle stream and open a new to parse at a different stream offset
subtitleStream = new SubtitleStream(subtitleStream)
subtitleStream.on('subtitle', (subtitle, trackNumber) =>
console.log('track ' + trackNumber + ':', subtitle))
// create a new stream and read from a specific position
fs.createReadStream(null, { fd: filestream.fd, start: offset }).pipe(subtitleStream).pipe(devnull())
})
// create a stream starting from the beginning of the file
const filestream = fs.createReadStream(process.argv[2])
// initial subtitle stream instance should start at stream offset 0
filestream.pipe(subtitleStream).pipe(devnull())