client/src/assets/player/peertube-videojs-plugin.ts

   1 import * as videojs from 'video.js'
   2 import * as WebTorrent from 'webtorrent'
   3 import { VideoFile } from '../../../../shared/models/videos/video.model'
   4 import { renderVideo } from './video-renderer'
   5 import './settings-menu-button'
   6 import { PeertubePluginOptions, VideoJSCaption, VideoJSComponentInterface, videojsUntyped } from './peertube-videojs-typings'
   7 import { isMobile, timeToInt, videoFileMaxByResolution, videoFileMinByResolution } from './utils'
   8 import * as CacheChunkStore from 'cache-chunk-store'
   9 import { PeertubeChunkStore } from './peertube-chunk-store'
  10 import {
  11   getAverageBandwidthInStore,
  12   getStoredMute,
  13   getStoredVolume,
  14   saveAverageBandwidth,
  15   saveMuteInStore,
  16   saveVolumeInStore
  17 } from './peertube-player-local-storage'
  18
  19 const Plugin: VideoJSComponentInterface = videojs.getPlugin('plugin')
  20 class PeerTubePlugin extends Plugin {
  21   private readonly playerElement: HTMLVideoElement
  22
  23   private readonly autoplay: boolean = false
  24   private readonly startTime: number = 0
  25   private readonly savePlayerSrcFunction: Function
  26   private readonly videoFiles: VideoFile[]
  27   private readonly videoViewUrl: string
  28   private readonly videoDuration: number
  29   private readonly CONSTANTS = {
  30     INFO_SCHEDULER: 1000, // Don't change this
  31     AUTO_QUALITY_SCHEDULER: 3000, // Check quality every 3 seconds
  32     AUTO_QUALITY_THRESHOLD_PERCENT: 30, // Bandwidth should be 30% more important than a resolution bitrate to change to it
  33     AUTO_QUALITY_OBSERVATION_TIME: 10000, // Wait 10 seconds after having change the resolution before another check
  34     AUTO_QUALITY_HIGHER_RESOLUTION_DELAY: 5000, // Buffering higher resolution during 5 seconds
  35     BANDWIDTH_AVERAGE_NUMBER_OF_VALUES: 5 // Last 5 seconds to build average bandwidth
  36   }
  37
  38   private readonly webtorrent = new WebTorrent({
  39     tracker: {
  40       rtcConfig: {
  41         iceServers: [
  42           {
  43             urls: 'stun:stun.stunprotocol.org'
  44           },
  45           {
  46             urls: 'stun:stun.framasoft.org'
  47           }
  48         ]
  49       }
  50     },
  51     dht: false
  52   })
  53
  54   private player: any
  55   private currentVideoFile: VideoFile
  56   private torrent: WebTorrent.Torrent
  57   private videoCaptions: VideoJSCaption[]
  58   private renderer
  59   private fakeRenderer
  60   private autoResolution = true
  61   private forbidAutoResolution = false
  62   private isAutoResolutionObservation = false
  63
  64   private videoViewInterval
  65   private torrentInfoInterval
  66   private autoQualityInterval
  67   private addTorrentDelay
  68   private qualityObservationTimer
  69   private runAutoQualitySchedulerTimer
  70
  71   private downloadSpeeds: number[] = []
  72
  73   constructor (player: videojs.Player, options: PeertubePluginOptions) {
  74     super(player, options)
  75
  76     // Disable auto play on iOS
  77     this.autoplay = options.autoplay && this.isIOS() === false
  78
  79     this.startTime = timeToInt(options.startTime)
  80     this.videoFiles = options.videoFiles
  81     this.videoViewUrl = options.videoViewUrl
  82     this.videoDuration = options.videoDuration
  83     this.videoCaptions = options.videoCaptions
  84
  85     this.savePlayerSrcFunction = this.player.src
  86     this.playerElement = options.playerElement
  87
  88     if (this.autoplay === true) this.player.addClass('vjs-has-autoplay')
  89
  90     this.player.ready(() => {
  91       const volume = getStoredVolume()
  92       if (volume !== undefined) this.player.volume(volume)
  93       const muted = getStoredMute()
  94       if (muted !== undefined) this.player.muted(muted)
  95
  96       this.initializePlayer()
  97       this.runTorrentInfoScheduler()
  98       this.runViewAdd()
  99
 100       this.player.one('play', () => {
 101         // Don't run immediately scheduler, wait some seconds the TCP connections are made
 102         this.runAutoQualitySchedulerTimer = setTimeout(() => this.runAutoQualityScheduler(), this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
 103       })
 104     })
 105
 106     this.player.on('volumechange', () => {
 107       saveVolumeInStore(this.player.volume())
 108       saveMuteInStore(this.player.muted())
 109     })
 110   }
 111
 112   dispose () {
 113     clearTimeout(this.addTorrentDelay)
 114     clearTimeout(this.qualityObservationTimer)
 115     clearTimeout(this.runAutoQualitySchedulerTimer)
 116
 117     clearInterval(this.videoViewInterval)
 118     clearInterval(this.torrentInfoInterval)
 119     clearInterval(this.autoQualityInterval)
 120
 121     // Don't need to destroy renderer, video player will be destroyed
 122     this.flushVideoFile(this.currentVideoFile, false)
 123
 124     this.destroyFakeRenderer()
 125   }
 126
 127   getCurrentResolutionId () {
 128     return this.currentVideoFile ? this.currentVideoFile.resolution.id : -1
 129   }
 130
 131   getCurrentResolutionLabel () {
 132     if (!this.currentVideoFile) return ''
 133
 134     const fps = this.currentVideoFile.fps >= 50 ? this.currentVideoFile.fps : ''
 135     return this.currentVideoFile.resolution.label + fps
 136   }
 137
 138   updateVideoFile (
 139     videoFile?: VideoFile,
 140     options: {
 141       forcePlay?: boolean,
 142       seek?: number,
 143       delay?: number
 144     } = {},
 145     done: () => void = () => { /* empty */ }
 146   ) {
 147     // Automatically choose the adapted video file
 148     if (videoFile === undefined) {
 149       const savedAverageBandwidth = getAverageBandwidthInStore()
 150       videoFile = savedAverageBandwidth
 151         ? this.getAppropriateFile(savedAverageBandwidth)
 152         : this.pickAverageVideoFile()
 153     }
 154
 155     // Don't add the same video file once again
 156     if (this.currentVideoFile !== undefined && this.currentVideoFile.magnetUri === videoFile.magnetUri) {
 157       return
 158     }
 159
 160     // Do not display error to user because we will have multiple fallback
 161     this.disableErrorDisplay()
 162
 163     // Hack to "simulate" src link in video.js >= 6
 164     // Without this, we can't play the video after pausing it
 165     // https://github.com/videojs/video.js/blob/master/src/js/player.js#L1633
 166     this.player.src = () => true
 167     const oldPlaybackRate = this.player.playbackRate()
 168
 169     const previousVideoFile = this.currentVideoFile
 170     this.currentVideoFile = videoFile
 171
 172     this.addTorrent(this.currentVideoFile.magnetUri, previousVideoFile, options, () => {
 173       this.player.playbackRate(oldPlaybackRate)
 174       return done()
 175     })
 176
 177     this.trigger('videoFileUpdate')
 178   }
 179
 180   updateResolution (resolutionId: number, delay = 0) {
 181     // Remember player state
 182     const currentTime = this.player.currentTime()
 183     const isPaused = this.player.paused()
 184
 185     // Remove poster to have black background
 186     this.playerElement.poster = ''
 187
 188     // Hide bigPlayButton
 189     if (!isPaused) {
 190       this.player.bigPlayButton.hide()
 191     }
 192
 193     const newVideoFile = this.videoFiles.find(f => f.resolution.id === resolutionId)
 194     const options = {
 195       forcePlay: false,
 196       delay,
 197       seek: currentTime + (delay / 1000)
 198     }
 199     this.updateVideoFile(newVideoFile, options)
 200   }
 201
 202   flushVideoFile (videoFile: VideoFile, destroyRenderer = true) {
 203     if (videoFile !== undefined && this.webtorrent.get(videoFile.magnetUri)) {
 204       if (destroyRenderer === true && this.renderer && this.renderer.destroy) this.renderer.destroy()
 205
 206       this.webtorrent.remove(videoFile.magnetUri)
 207       console.log('Removed ' + videoFile.magnetUri)
 208     }
 209   }
 210
 211   isAutoResolutionOn () {
 212     return this.autoResolution
 213   }
 214
 215   enableAutoResolution () {
 216     this.autoResolution = true
 217     this.trigger('autoResolutionUpdate')
 218   }
 219
 220   disableAutoResolution (forbid = false) {
 221     if (forbid === true) this.forbidAutoResolution = true
 222
 223     this.autoResolution = false
 224     this.trigger('autoResolutionUpdate')
 225   }
 226
 227   isAutoResolutionForbidden () {
 228     return this.forbidAutoResolution === true
 229   }
 230
 231   getCurrentVideoFile () {
 232     return this.currentVideoFile
 233   }
 234
 235   getTorrent () {
 236     return this.torrent
 237   }
 238
 239   private addTorrent (
 240     magnetOrTorrentUrl: string,
 241     previousVideoFile: VideoFile,
 242     options: {
 243       forcePlay?: boolean,
 244       seek?: number,
 245       delay?: number
 246     },
 247     done: Function
 248   ) {
 249     console.log('Adding ' + magnetOrTorrentUrl + '.')
 250
 251     const oldTorrent = this.torrent
 252     const torrentOptions = {
 253       store: (chunkLength, storeOpts) => new CacheChunkStore(new PeertubeChunkStore(chunkLength, storeOpts), {
 254         max: 100
 255       })
 256     }
 257
 258     this.torrent = this.webtorrent.add(magnetOrTorrentUrl, torrentOptions, torrent => {
 259       console.log('Added ' + magnetOrTorrentUrl + '.')
 260
 261       if (oldTorrent) {
 262         // Pause the old torrent
 263         this.stopTorrent(oldTorrent)
 264
 265         // We use a fake renderer so we download correct pieces of the next file
 266         if (options.delay) this.renderFileInFakeElement(torrent.files[ 0 ], options.delay)
 267       }
 268
 269       // Render the video in a few seconds? (on resolution change for example, we wait some seconds of the new video resolution)
 270       this.addTorrentDelay = setTimeout(() => {
 271         // We don't need the fake renderer anymore
 272         this.destroyFakeRenderer()
 273
 274         const paused = this.player.paused()
 275
 276         this.flushVideoFile(previousVideoFile)
 277
 278         const renderVideoOptions = { autoplay: false, controls: true }
 279         renderVideo(torrent.files[ 0 ], this.playerElement, renderVideoOptions, (err, renderer) => {
 280           this.renderer = renderer
 281
 282           if (err) return this.fallbackToHttp(done)
 283
 284           return this.tryToPlay(err => {
 285             if (err) return done(err)
 286
 287             if (options.seek) this.seek(options.seek)
 288             if (options.forcePlay === false && paused === true) this.player.pause()
 289
 290             return done(err)
 291           })
 292         })
 293       }, options.delay || 0)
 294     })
 295
 296     this.torrent.on('error', err => console.error(err))
 297
 298     this.torrent.on('warning', (err: any) => {
 299       // We don't support HTTP tracker but we don't care -> we use the web socket tracker
 300       if (err.message.indexOf('Unsupported tracker protocol') !== -1) return
 301
 302       // Users don't care about issues with WebRTC, but developers do so log it in the console
 303       if (err.message.indexOf('Ice connection failed') !== -1) {
 304         console.log(err)
 305         return
 306       }
 307
 308       // Magnet hash is not up to date with the torrent file, add directly the torrent file
 309       if (err.message.indexOf('incorrect info hash') !== -1) {
 310         console.error('Incorrect info hash detected, falling back to torrent file.')
 311         const newOptions = { forcePlay: true, seek: options.seek }
 312         return this.addTorrent(this.torrent[ 'xs' ], previousVideoFile, newOptions, done)
 313       }
 314
 315       // Remote instance is down
 316       if (err.message.indexOf('from xs param') !== -1) {
 317         this.handleError(err)
 318       }
 319
 320       console.warn(err)
 321     })
 322   }
 323
 324   private tryToPlay (done?: Function) {
 325     if (!done) done = function () { /* empty */ }
 326
 327     const playPromise = this.player.play()
 328     if (playPromise !== undefined) {
 329       return playPromise.then(done)
 330                         .catch(err => {
 331                           if (err.message.indexOf('The play() request was interrupted by a call to pause()') !== -1) {
 332                             return
 333                           }
 334
 335                           console.error(err)
 336                           this.player.pause()
 337                           this.player.posterImage.show()
 338                           this.player.removeClass('vjs-has-autoplay')
 339                           this.player.removeClass('vjs-has-big-play-button-clicked')
 340
 341                           return done()
 342                         })
 343     }
 344
 345     return done()
 346   }
 347
 348   private seek (time: number) {
 349     this.player.currentTime(time)
 350     this.player.handleTechSeeked_()
 351   }
 352
 353   private getAppropriateFile (averageDownloadSpeed?: number): VideoFile {
 354     if (this.videoFiles === undefined || this.videoFiles.length === 0) return undefined
 355     if (this.videoFiles.length === 1) return this.videoFiles[0]
 356
 357     // Don't change the torrent is the play was ended
 358     if (this.torrent && this.torrent.progress === 1 && this.player.ended()) return this.currentVideoFile
 359
 360     if (!averageDownloadSpeed) averageDownloadSpeed = this.getAndSaveActualDownloadSpeed()
 361
 362     // Limit resolution according to player height
 363     const playerHeight = this.playerElement.offsetHeight as number
 364
 365     // We take the first resolution just above the player height
 366     // Example: player height is 530px, we want the 720p file instead of 480p
 367     let maxResolution = this.videoFiles[0].resolution.id
 368     for (let i = this.videoFiles.length - 1; i >= 0; i--) {
 369       const resolutionId = this.videoFiles[i].resolution.id
 370       if (resolutionId >= playerHeight) {
 371         maxResolution = resolutionId
 372         break
 373       }
 374     }
 375
 376     // Filter videos we can play according to our screen resolution and bandwidth
 377     const filteredFiles = this.videoFiles
 378                               .filter(f => f.resolution.id <= maxResolution)
 379                               .filter(f => {
 380                                 const fileBitrate = (f.size / this.videoDuration)
 381                                 let threshold = fileBitrate
 382
 383                                 // If this is for a higher resolution or an initial load: add a margin
 384                                 if (!this.currentVideoFile || f.resolution.id > this.currentVideoFile.resolution.id) {
 385                                   threshold += ((fileBitrate * this.CONSTANTS.AUTO_QUALITY_THRESHOLD_PERCENT) / 100)
 386                                 }
 387
 388                                 return averageDownloadSpeed > threshold
 389                               })
 390
 391     // If the download speed is too bad, return the lowest resolution we have
 392     if (filteredFiles.length === 0) return videoFileMinByResolution(this.videoFiles)
 393
 394     return videoFileMaxByResolution(filteredFiles)
 395   }
 396
 397   private getAndSaveActualDownloadSpeed () {
 398     const start = Math.max(this.downloadSpeeds.length - this.CONSTANTS.BANDWIDTH_AVERAGE_NUMBER_OF_VALUES, 0)
 399     const lastDownloadSpeeds = this.downloadSpeeds.slice(start, this.downloadSpeeds.length)
 400     if (lastDownloadSpeeds.length === 0) return -1
 401
 402     const sum = lastDownloadSpeeds.reduce((a, b) => a + b)
 403     const averageBandwidth = Math.round(sum / lastDownloadSpeeds.length)
 404
 405     // Save the average bandwidth for future use
 406     saveAverageBandwidth(averageBandwidth)
 407
 408     return averageBandwidth
 409   }
 410
 411   private initializePlayer () {
 412     if (isMobile()) this.player.addClass('vjs-is-mobile')
 413
 414     this.initSmoothProgressBar()
 415
 416     this.initCaptions()
 417
 418     this.alterInactivity()
 419
 420     if (this.autoplay === true) {
 421       this.player.posterImage.hide()
 422
 423       return this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
 424     }
 425
 426     // Don't try on iOS that does not support MediaSource
 427     if (this.isIOS()) {
 428       this.currentVideoFile = this.pickAverageVideoFile()
 429       return this.fallbackToHttp(undefined, false)
 430     }
 431
 432     // Proxy first play
 433     const oldPlay = this.player.play.bind(this.player)
 434     this.player.play = () => {
 435       this.player.addClass('vjs-has-big-play-button-clicked')
 436       this.player.play = oldPlay
 437
 438       this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
 439     }
 440   }
 441
 442   private runAutoQualityScheduler () {
 443     this.autoQualityInterval = setInterval(() => {
 444
 445       // Not initialized or in HTTP fallback
 446       if (this.torrent === undefined || this.torrent === null) return
 447       if (this.isAutoResolutionOn() === false) return
 448       if (this.isAutoResolutionObservation === true) return
 449
 450       const file = this.getAppropriateFile()
 451       let changeResolution = false
 452       let changeResolutionDelay = 0
 453
 454       // Lower resolution
 455       if (this.isPlayerWaiting() && file.resolution.id < this.currentVideoFile.resolution.id) {
 456         console.log('Downgrading automatically the resolution to: %s', file.resolution.label)
 457         changeResolution = true
 458       } else if (file.resolution.id > this.currentVideoFile.resolution.id) { // Higher resolution
 459         console.log('Upgrading automatically the resolution to: %s', file.resolution.label)
 460         changeResolution = true
 461         changeResolutionDelay = this.CONSTANTS.AUTO_QUALITY_HIGHER_RESOLUTION_DELAY
 462       }
 463
 464       if (changeResolution === true) {
 465         this.updateResolution(file.resolution.id, changeResolutionDelay)
 466
 467         // Wait some seconds in observation of our new resolution
 468         this.isAutoResolutionObservation = true
 469
 470         this.qualityObservationTimer = setTimeout(() => {
 471           this.isAutoResolutionObservation = false
 472         }, this.CONSTANTS.AUTO_QUALITY_OBSERVATION_TIME)
 473       }
 474     }, this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
 475   }
 476
 477   private isPlayerWaiting () {
 478     return this.player && this.player.hasClass('vjs-waiting')
 479   }
 480
 481   private runTorrentInfoScheduler () {
 482     this.torrentInfoInterval = setInterval(() => {
 483       // Not initialized yet
 484       if (this.torrent === undefined) return
 485
 486       // Http fallback
 487       if (this.torrent === null) return this.trigger('torrentInfo', false)
 488
 489       // this.webtorrent.downloadSpeed because we need to take into account the potential old torrent too
 490       if (this.webtorrent.downloadSpeed !== 0) this.downloadSpeeds.push(this.webtorrent.downloadSpeed)
 491
 492       return this.trigger('torrentInfo', {
 493         downloadSpeed: this.torrent.downloadSpeed,
 494         numPeers: this.torrent.numPeers,
 495         uploadSpeed: this.torrent.uploadSpeed,
 496         downloaded: this.torrent.downloaded,
 497         uploaded: this.torrent.uploaded
 498       })
 499     }, this.CONSTANTS.INFO_SCHEDULER)
 500   }
 501
 502   private runViewAdd () {
 503     this.clearVideoViewInterval()
 504
 505     // After 30 seconds (or 3/4 of the video), add a view to the video
 506     let minSecondsToView = 30
 507
 508     if (this.videoDuration < minSecondsToView) minSecondsToView = (this.videoDuration * 3) / 4
 509
 510     let secondsViewed = 0
 511     this.videoViewInterval = setInterval(() => {
 512       if (this.player && !this.player.paused()) {
 513         secondsViewed += 1
 514
 515         if (secondsViewed > minSecondsToView) {
 516           this.clearVideoViewInterval()
 517
 518           this.addViewToVideo().catch(err => console.error(err))
 519         }
 520       }
 521     }, 1000)
 522   }
 523
 524   private clearVideoViewInterval () {
 525     if (this.videoViewInterval !== undefined) {
 526       clearInterval(this.videoViewInterval)
 527       this.videoViewInterval = undefined
 528     }
 529   }
 530
 531   private addViewToVideo () {
 532     if (!this.videoViewUrl) return Promise.resolve(undefined)
 533
 534     return fetch(this.videoViewUrl, { method: 'POST' })
 535   }
 536
 537   private fallbackToHttp (done?: Function, play = true) {
 538     this.disableAutoResolution(true)
 539
 540     this.flushVideoFile(this.currentVideoFile, true)
 541     this.torrent = null
 542
 543     // Enable error display now this is our last fallback
 544     this.player.one('error', () => this.enableErrorDisplay())
 545
 546     const httpUrl = this.currentVideoFile.fileUrl
 547     this.player.src = this.savePlayerSrcFunction
 548     this.player.src(httpUrl)
 549     if (play) this.tryToPlay()
 550
 551     if (done) return done()
 552   }
 553
 554   private handleError (err: Error | string) {
 555     return this.player.trigger('customError', { err })
 556   }
 557
 558   private enableErrorDisplay () {
 559     this.player.addClass('vjs-error-display-enabled')
 560   }
 561
 562   private disableErrorDisplay () {
 563     this.player.removeClass('vjs-error-display-enabled')
 564   }
 565
 566   private isIOS () {
 567     return !!navigator.platform && /iPad|iPhone|iPod/.test(navigator.platform)
 568   }
 569
 570   private alterInactivity () {
 571     let saveInactivityTimeout: number
 572
 573     const disableInactivity = () => {
 574       saveInactivityTimeout = this.player.options_.inactivityTimeout
 575       this.player.options_.inactivityTimeout = 0
 576     }
 577     const enableInactivity = () => {
 578       this.player.options_.inactivityTimeout = saveInactivityTimeout
 579     }
 580
 581     const settingsDialog = this.player.children_.find(c => c.name_ === 'SettingsDialog')
 582
 583     this.player.controlBar.on('mouseenter', () => disableInactivity())
 584     settingsDialog.on('mouseenter', () => disableInactivity())
 585     this.player.controlBar.on('mouseleave', () => enableInactivity())
 586     settingsDialog.on('mouseleave', () => enableInactivity())
 587   }
 588
 589   private pickAverageVideoFile () {
 590     if (this.videoFiles.length === 1) return this.videoFiles[0]
 591
 592     return this.videoFiles[Math.floor(this.videoFiles.length / 2)]
 593   }
 594
 595   private stopTorrent (torrent: WebTorrent.Torrent) {
 596     torrent.pause()
 597     // Pause does not remove actual peers (in particular the webseed peer)
 598     torrent.removePeer(torrent[ 'ws' ])
 599   }
 600
 601   private renderFileInFakeElement (file: WebTorrent.TorrentFile, delay: number) {
 602     const fakeVideoElem = document.createElement('video')
 603     renderVideo(file, fakeVideoElem, { autoplay: false, controls: false }, (err, renderer) => {
 604       this.fakeRenderer = renderer
 605
 606       if (err) console.error('Cannot render new torrent in fake video element.', err)
 607
 608       // Load the future file at the correct time (in delay MS - 2 seconds)
 609       fakeVideoElem.currentTime = this.player.currentTime() + (delay - 2000)
 610     })
 611   }
 612
 613   private destroyFakeRenderer () {
 614     if (this.fakeRenderer) {
 615       if (this.fakeRenderer.destroy) {
 616         try {
 617           this.fakeRenderer.destroy()
 618         } catch (err) {
 619           console.log('Cannot destroy correctly fake renderer.', err)
 620         }
 621       }
 622       this.fakeRenderer = undefined
 623     }
 624   }
 625
 626   private initCaptions () {
 627     for (const caption of this.videoCaptions) {
 628       this.player.addRemoteTextTrack({
 629         kind: 'captions',
 630         label: caption.label,
 631         language: caption.language,
 632         id: caption.language,
 633         src: caption.src
 634       }, false)
 635     }
 636   }
 637
 638   // Thanks: https://github.com/videojs/video.js/issues/4460#issuecomment-312861657
 639   private initSmoothProgressBar () {
 640     const SeekBar = videojsUntyped.getComponent('SeekBar')
 641     SeekBar.prototype.getPercent = function getPercent () {
 642       // Allows for smooth scrubbing, when player can't keep up.
 643       // const time = (this.player_.scrubbing()) ?
 644       //   this.player_.getCache().currentTime :
 645       //   this.player_.currentTime()
 646       const time = this.player_.currentTime()
 647       const percent = time / this.player_.duration()
 648       return percent >= 1 ? 1 : percent
 649     }
 650     SeekBar.prototype.handleMouseMove = function handleMouseMove (event) {
 651       let newTime = this.calculateDistance(event) * this.player_.duration()
 652       if (newTime === this.player_.duration()) {
 653         newTime = newTime - 0.1
 654       }
 655       this.player_.currentTime(newTime)
 656       this.update()
 657     }
 658   }
 659 }
 660
 661 videojs.registerPlugin('peertube', PeerTubePlugin)
 662 export { PeerTubePlugin }