Media Source Extension support for Flussonic.


21.9.215 days ago4 years agoMinified + gzip package size for @flussonic/flussonic-mse-player in KB



flussonic-mse-player is a JavaScript library for playing video relies on flussonic backend, HTML5 video and MediaSource Extensions


npm install --save @flussonic/flussonic-mse-player



import FlussonicMsePlayer from '@flussonic/flussonic-mse-player'
const player = new FlussonicMsePlayer(element, url, opts)


Script tag:

Since the library include via script tag it is accesible at window.FlussonicMsePlayer

<script type="text/javascript" src="../../dist/FlussonicMsePlayer.js"></script>
var FlussonicMsePlayer = window.FlussonicMsePlayer
var player = new FlussonicMsePlayer(element, url, opts)


Static Methods:

  • isSupported() - return true if browser is supported Media Source Extension

  • replaceHttpByWS(url: string) - return new url where replaced http(s):// by ws(s)://


const player = new FlussonicMsePlayer(element, url, opts)

element - DOM element

url - url of a stream

opts is plain object it can include methods:

  • debug?: boolean - if true then enable logs in browser console. And export methods humanTime, humanDate to window.

  • progressUpdateTime?: number - time period for invoking onProgress.

  • connectionRetries?: number - number of reconnection retries if player can't start playback.

  • wsReconnect?: boolean - trying to restart websocket connection on error closing.

  • preferHQ?: boolean - if true, player will automatically select the highest available quality of the stream.

  • retryMuted?: boolean - if true, in some cases, due to "Browser Autoplay Policy Changes" it will try to restart playing process with initialy muted video element.

  • maxBufferDelay?: number - maxBufferDelay option for sourceBuffer

  • onProgress(utc: number) - triggered every 100ms(progressUpdateTime) while a stream is playing and gives current playback time

  • onMediaInfo(info: MediaInfo) - triggered when metadata of the stream is available. metadata include a common information of the stream such as width, height, information about mbr streams and so on. After this callback triggered you can use getVideoTracks()/getAudioTracks() methods.

  • onDisconnect(status: object) - triggered on websocket connection lost.

  • onError(error: object) - triggered on player errors.

  • onEvent(event: object) - triggered on player events.

  • onMuted() - triggered on player set muted.

  • onPause() - triggered on player set paused.

  • onResume() - triggered on player gets resumed from pause.

  • onStats(stats: object) - triggered on player stats change. Stats include a common ststistics of the stream: endTime, currentTime, videoBuffer, audioBuffer, timestamp, readyState, networkState.

  • onSeeked() - triggered when process of seeking is finished

  • onStartStalling() - triggered when playing is stalled

  • onEndStalling() - triggered when the video tag is progressed(start playing). onStartStalling()/onEndStalling() useful callback for implementation loading-spinner.

  • •••DEPRECATED••• bufferMode: 'segments'|'sequence' - SourceBuffer Object Append Mode. Default value is 'sequence'.

  • errorsBeforeStop: number - Amount of errors will be happened before invoke the stop() method.


  • play(videoTrack?: Track, audioTrack?: Track) => Promise - start playing.

    Return a Promise. Resolved if HTMLMediaElement.play() resolved(HTMLMediaElement.play() Returns a Promise). Overwise rejected with error message.

    if you do autoplay="true" muted="false" video. The play will be rejected(Autoplay Policy Changes)

    For resolve this behaviour you can mute the video before playing. Or you can process play's rejection and show play button.

  • pause() - send pause command by websocket

  • stop() - close websocket connection; detach mediaSource from given HTMLMediaElement; invoke the HTMLMediaElement stop method

  • restart() - perform a full restart of playing process

  • autoTrackSelection(preferBest: boolean) => tracks: Array - if true - returns array with the tracks of highest available quality. If false - returns array with the tracks of the lowest available quality.

  • seek(utc: number) - send seek command by websocket

  • setTracks(tracks: Array) -


type MediaInfo = {
  height: number,
  width: number,
  streams: Array<StreamInfo>,
  activeStreams: ActiveStreams,

type StreamInfo = {
  bitrate: number,
  codec: string,
  content: string,
  fps: number,
  height: number,
  length_size: number,
  level: string,
  pixel_height: number,
  pixel_width: number,
  profile: "Baseline",
  sar_height: number,
  sar_width: number,
  size: string,
  track_id: TrackId,
  width: number

type ActiveStreams = {
  video: TrackId,
  audio: TrackId,

type TrackId = 'a1'|'a2'|'a3'| ... 'aN'|'v1'|'v2'|'v3'| ... 'vN'

type UtcOrLive = number | 'live'



If you find any bugs or have a feature request, please open an issue on github!

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