mafintosh/index.html

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Hello World!</title>
  </head>
  <body>
    <video src="custom://u" controls></video>
    <!-- <video src="http://localhost:9999" controls></video> -->
  </body>
</html>

## main.js
const {app, BrowserWindow, protocol} = require('electron')
const stream = require('stream')
const fs = require('fs')
const url = require('url')
let mainWindow

const path = 'test.mp4'

protocol.registerSchemesAsPrivileged([
  { scheme: 'custom', privileges: { stream: true, standard: true, secure: true, allowServiceWorkers: true, supportFetchAPI: true, corsEnabled: true } }
])

function reply (request, res) {
  function replyRes (r) {
    res.writeHead(r.statusCode, r.headers)
    r.data.pipe(res)
    r.data.on('error', () => res.destroy())
    res.on('error', () => r.data.destroy())
    res.on('close', () => r.data.destroy())
  }

  const cb = typeof res === 'function' ? res : replyRes

  const stat = fs.statSync(path)
  const fileSize = stat.size
  const range = request.headers.Range
  if (range) {
    const parts = range.replace(/bytes=/, "").split("-")
    const start = parseInt(parts[0], 10)
    const end = parts[1]
      ? parseInt(parts[1], 10)
      : fileSize-1
    const chunksize = (end-start)+1
    const headers = {
      'Content-Range': `bytes ${start}-${end}/${fileSize}`,
      'Accept-Ranges': 'bytes',
      'Content-Length': String(chunksize),
      'Content-Type': 'video/mp4',
    }

    cb({
      statusCode: 206,
      headers,
      data: fs.createReadStream(path, {start, end})
    })
  } else {

    cb({
      statusCode: 200,
      headers: {
        'Accept-Ranges': 'bytes',
        'Content-Length': String(fileSize),
        'Content-Type': 'video/mp4',
      },
      data: fs.createReadStream(path)
    })
  }
}


require('http').createServer(reply).listen(9999)

function createWindow () {
  protocol.registerStreamProtocol("custom", reply)

  // Create the browser window.
  mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      nodeIntegration: true
    }
  })

  // and load the index.html of the app.
  mainWindow.loadFile('index.html')

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()

  // Emitted when the window is closed.
  mainWindow.on('closed', function () {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainWindow = null
  })
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow)

// Quit when all windows are closed.
app.on('window-all-closed', function () {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  if (process.platform !== 'darwin') {
    app.quit()
  }
})

app.on('activate', function () {
  // On OS X it's common to re-create a window in the app when the
  // dock icon is clicked and there are no other windows open.
  if (mainWindow === null) {
    createWindow()
  }
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.

## renderer.js
// empty
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8">
	<title>Hello World!</title>
	</head>
	<body>
	<video src="custom://u" controls></video>
	<!-- <video src="http://localhost:9999" controls></video> -->
	</body>
	</html>
	const {app, BrowserWindow, protocol} = require('electron')
	const stream = require('stream')
	const fs = require('fs')
	const url = require('url')
	let mainWindow

	const path = 'test.mp4'

	protocol.registerSchemesAsPrivileged([
	{ scheme: 'custom', privileges: { stream: true, standard: true, secure: true, allowServiceWorkers: true, supportFetchAPI: true, corsEnabled: true } }
	])

	function reply (request, res) {
	function replyRes (r) {
	res.writeHead(r.statusCode, r.headers)
	r.data.pipe(res)
	r.data.on('error', () => res.destroy())
	res.on('error', () => r.data.destroy())
	res.on('close', () => r.data.destroy())
	}

	const cb = typeof res === 'function' ? res : replyRes

	const stat = fs.statSync(path)
	const fileSize = stat.size
	const range = request.headers.Range
	if (range) {
	const parts = range.replace(/bytes=/, "").split("-")
	const start = parseInt(parts[0], 10)
	const end = parts[1]
	? parseInt(parts[1], 10)
	: fileSize-1
	const chunksize = (end-start)+1
	const headers = {
	'Content-Range': `bytes ${start}-${end}/${fileSize}`,
	'Accept-Ranges': 'bytes',
	'Content-Length': String(chunksize),
	'Content-Type': 'video/mp4',
	}

	cb({
	statusCode: 206,
	headers,
	data: fs.createReadStream(path, {start, end})
	})
	} else {

	cb({
	statusCode: 200,
	headers: {
	'Accept-Ranges': 'bytes',
	'Content-Length': String(fileSize),
	'Content-Type': 'video/mp4',
	},
	data: fs.createReadStream(path)
	})
	}
	}


	require('http').createServer(reply).listen(9999)

	function createWindow () {
	protocol.registerStreamProtocol("custom", reply)

	// Create the browser window.
	mainWindow = new BrowserWindow({
	width: 800,
	height: 600,
	webPreferences: {
	nodeIntegration: true
	}
	})

	// and load the index.html of the app.
	mainWindow.loadFile('index.html')

	// Open the DevTools.
	// mainWindow.webContents.openDevTools()

	// Emitted when the window is closed.
	mainWindow.on('closed', function () {
	// Dereference the window object, usually you would store windows
	// in an array if your app supports multi windows, this is the time
	// when you should delete the corresponding element.
	mainWindow = null
	})
	}

	// This method will be called when Electron has finished
	// initialization and is ready to create browser windows.
	// Some APIs can only be used after this event occurs.
	app.on('ready', createWindow)

	// Quit when all windows are closed.
	app.on('window-all-closed', function () {
	// On OS X it is common for applications and their menu bar
	// to stay active until the user quits explicitly with Cmd + Q
	if (process.platform !== 'darwin') {
	app.quit()
	}
	})

	app.on('activate', function () {
	// On OS X it's common to re-create a window in the app when the
	// dock icon is clicked and there are no other windows open.
	if (mainWindow === null) {
	createWindow()
	}
	})

	// In this file you can include the rest of your app's specific main process
	// code. You can also put them in separate files and require them here.