21.10.3 • Public • Published


    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'





    npm i @flussonic/flussonic-mse-player

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