├── .gitignore
├── LICENSE
├── README.md
├── bin.js
└── package.json


/.gitignore:
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1 | node_modules
2 | 


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/LICENSE:
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 1 | The MIT License (MIT)
 2 | 
 3 | Copyright (c) 2019 Mathias Buus
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in
13 | all copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21 | THE SOFTWARE.
22 | 


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/README.md:
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 1 | # web-transcode
 2 | 
 3 | CLI program to transcode video + captions for playback in a Browser
 4 | 
 5 | ```sh
 6 | npm i -g web-transcode
 7 | 
 8 | # will create web/video.mp4, web/video.vtt, web/video.html
 9 | #
10 | # video.mp4 is the transcoded video with video codec h264
11 | # video.vtt is the vtt captions file
12 | #
13 | # video.html will contain a simple fullscreen player
14 | # that adds the subtitles to the video
15 | 
16 | web-transcode -i video.something -o web -s subtitle.srt
17 | ```
18 | 
19 | Requires ffmpeg to be installed in your PATH.
20 | 


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/bin.js:
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  1 | #!/usr/bin/env node
  2 | 
  3 | const vtt = require('srt-to-vtt')
  4 | const { spawn, spawnSync } = require('child_process')
  5 | const { mkdirSync, createReadStream, createWriteStream, writeFileSync, existsSync } = require('fs')
  6 | const minimist = require('minimist')
  7 | const path = require('path')
  8 | const pump = require('pump')
  9 | const os = require('os')
 10 | 
 11 | const argv = minimist(process.argv.slice(2), {
 12 |   alias: {
 13 |     input: 'i',
 14 |     subtitles: 's',
 15 |     subs: 's',
 16 |     sub: 's',
 17 |     out: 'o',
 18 |     name: 'n'
 19 |   },
 20 |   '--': true
 21 | })
 22 | 
 23 | const onlyMp4 = !!argv['only-mp4']
 24 | 
 25 | if (!argv.out) {
 26 |   argv.out = 'web'
 27 | }
 28 | 
 29 | if (!argv.input || argv.help) {
 30 |   console.log('Usage: web-transcode -i <media-file> ( -s subtitles -n name -o ./web --only-mp4? )')
 31 |   process.exit(1)
 32 | }
 33 | 
 34 | if (!existsSync(argv.input)) {
 35 |   console.log('Input file does not exist')
 36 |   process.exit(2)
 37 | }
 38 | 
 39 | if (argv.s === true || argv.s === 'auto') {
 40 |   const tmp = tmpFile('srt')
 41 |   spawnSync('ffmpeg', [ '-i', argv.input, '-map', '0:s:0', tmp ], { stdio: 'inherit' })
 42 |   argv.s = tmp
 43 | }
 44 | 
 45 | if (argv.s && !existsSync(argv.s)) {
 46 |   console.log('Subtitle file does not exist')
 47 |   process.exit(2)
 48 | }
 49 | 
 50 | const name = (argv.name || path.basename(argv.input, path.extname(argv.input)))
 51 | 
 52 | try {
 53 |   mkdirSync(argv.out)
 54 | } catch (_) {}
 55 | 
 56 | const mediaOut = path.join(argv.out, name + '.mp4')
 57 | const subsOut = onlyMp4 ? tmpFile('.vtt') : path.join(argv.out, name + '.vtt')
 58 | const htmlOut = onlyMp4 ? tmpFile('.html') : path.join(argv.out, name + '.html')
 59 | 
 60 | const { stderr } = spawnSync('ffmpeg', [ '-i', argv.input, '-hide_banner' ])
 61 | 
 62 | let v = (stderr.toString().match(/Stream #0.+ Video: (\w+) /) || [ null, null ])[1]
 63 | let a = (stderr.toString().match(/Stream #0.+ Audio: (\w+) /) || [ null, null ])[1]
 64 | 
 65 | if (v === 'h264') v = 'copy'
 66 | else v = 'h264'
 67 | 
 68 | if (a === 'aac') a = 'copy'
 69 | else a = 'aac'
 70 | 
 71 | if (argv.s) {
 72 |   const stream = /\.vtt$/.test(argv.s)
 73 |     ? createReadStream(argv.s)
 74 |     : pump(createReadStream(argv.s), vtt())
 75 |   pump(stream, createWriteStream(subsOut), function (err) {
 76 |     if (err) throw err
 77 |     ready()
 78 |   })
 79 | } else {
 80 |   ready()
 81 | }
 82 | 
 83 | function ready () {
 84 |   const extraArgs = [].concat(argv['--'] || [])
 85 |   const subArgs = []
 86 | 
 87 |   if (argv.s) {
 88 |     subArgs.push(
 89 |       '-i',
 90 |       subsOut,
 91 |       '-c:s',
 92 |       'mov_text'
 93 |     )
 94 |   }
 95 | 
 96 |   spawn('ffmpeg', [
 97 |     '-i', argv.input,
 98 |     ...subArgs,
 99 |     '-y',
100 |     '-hide_banner',
101 |     '-vcodec', v,
102 |     '-acodec', a,
103 |     ...extraArgs,
104 |     mediaOut
105 |   ], { stdio: 'inherit' })
106 | 
107 |   if (argv.html !== false) {
108 |     writeFileSync(htmlOut, `<html>
109 |     <head>
110 |       <style>
111 |         html, body {
112 |           margin: 0;
113 |           padding: 0;
114 |           background-color: black;
115 |         }
116 | 
117 |         video {
118 |           width: 100%;
119 |           height: 100%;
120 |           max-height: 100%;
121 |           max-width: 100%;
122 |         }
123 |       </style>
124 |     </head>
125 |     <body>
126 |       <video controls autoplay>
127 |         <source type="video/mp4" src="${name}.mp4">
128 |         ${argv.s ? `<track src="${name}.vtt" label="Subtitles" kind="captions" default>` : ''}
129 |       </video>
130 |     </body>
131 |   </html>
132 |   `)
133 |   }
134 | }
135 | 
136 | function tmpFile (ext) {
137 |   return path.join(os.tmpdir(), 'web-transcode.' + Math.random().toString(16).slice(2) + '.' + ext)
138 | }
139 | 


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/package.json:
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 1 | {
 2 |   "name": "web-transcode",
 3 |   "version": "1.4.0",
 4 |   "description": "Transcodes a video file plus captions so it can be played in a browser",
 5 |   "main": "bin.js",
 6 |   "bin": {
 7 |     "web-transcode": "./bin.js"
 8 |   },
 9 |   "dependencies": {
10 |     "minimist": "^1.2.0",
11 |     "pump": "^3.0.0",
12 |     "srt-to-vtt": "^1.1.3"
13 |   },
14 |   "devDependencies": {
15 |     "standard": "^12.0.1"
16 |   },
17 |   "scripts": {
18 |     "test": "standard"
19 |   },
20 |   "author": "Mathias Buus (@mafintosh)",
21 |   "license": "MIT"
22 | }
23 | 


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