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hls.js

hls.js is a JavaScript library which implements an HTTP Live Streaming client. It relies on HTML5 video and MediaSource Extensions for playback.

It works by transmuxing MPEG-2 Transport Stream and AAC/MP3 streams into ISO BMFF (MP4) fragments. This transmuxing could be performed asynchronously using Web Worker if available in the browser. hls.js also supports HLS + fmp4, as announced during WWDC2016

hls.js does not need any player, it works directly on top of a standard HTML<video>element.

hls.js is written in ECMAScript6, and transpiled in ECMAScript5 using Babel.

Demo

http://video-dev.github.io/hls.js/demo

Getting Started

<script src="https://cdn.jsdelivr.net/npm/hls.js@latest"></script>
<video id="video"></video>
<script>
  if(Hls.isSupported()) {
    var video = document.getElementById('video');
    var hls = new Hls();
    hls.loadSource('https://video-dev.github.io/streams/x36xhzz/x36xhzz.m3u8');
    hls.attachMedia(video);
    hls.on(Hls.Events.MANIFEST_PARSED,function() {
      video.play();
  });
 }
</script>

Video Control

Video is controlled through HTML <video> element.

HTMLVideoElement control and events could be used seamlessly.

they use hls.js in production !

Player Integration

hls.js is (being) integrated in the following players:

Chrome/Firefox integration

made by gramk,plays hls from address bar and m3u8 links

Dependencies

No external JS libs are needed. Prepackaged build is included in the dist folder:

If you want to bundle the application yourself, use node

npm install hls.js

NOTE: hls.light.*.js dist files do not include subtitling and alternate-audio features.

Installation

Either directly include dist/hls.js or dist/hls.min.js

Or type

npm install --save hls.js

Optionally there is a declaration file available to help with code completion and hinting within your IDE for the hls.js api

npm install --save-dev @types/hls.js

Compatibility

hls.js is compatible with browsers supporting MSE with 'video/MP4' inputs. As of today, it is supported on:

  • Chrome for Android 34+
  • Chrome for Desktop 34+
  • Firefox for Android 41+
  • Firefox for Desktop 42+
  • IE11+ for Windows 8.1+
  • Edge for Windows 10+
  • Opera for Desktop
  • Vivaldi for Desktop
  • Safari for Mac 8+ (beta)

CORS

All HLS resources must be delivered with CORS headers permitting GET requests.

Features

  • VoD & Live playlists
    • DVR support on Live playlists
  • fragmented MP4 container (beta)
  • MPEG-2 TS container
    • ITU-T Rec. H.264 and ISO/IEC 14496-10 Elementary Stream
    • ISO/IEC 13818-7 ADTS AAC Elementary Stream
    • ISO/IEC 11172-3 / ISO/IEC 13818-3 (MPEG-1/2 Audio Layer III) Elementary Stream
    • Packetized metadata (ID3) Elementary Stream
  • AAC container (audio only streams)
  • MPEG Audio container (MPEG-1/2 Audio Layer III audio only streams)
  • Timed Metadata for HTTP Live Streaming (in ID3 format, carried in MPEG-2 TS)
  • AES-128 decryption
  • SAMPLE-AES decryption
  • CEA-608/708 captionss
  • WebVTT subtitles
  • Alternate Audio Track Rendition (Master Playlist with alternative Audio) for VoD and Live playlists
  • Adaptive streaming
    • Manual & Auto Quality Switching
      • 3 Quality Switching modes are available (controllable through API means)
        • Instant switching (immediate quality switch at current video position)
        • Smooth switching (quality switch for next loaded fragment)
        • Bandwidth conservative switching (quality switch change for next loaded fragment, without flushing the buffer)
      • In Auto-Quality mode, emergency switch down in case bandwidth is suddenly dropping to minimize buffering.
  • Accurate Seeking on VoD & Live (not limited to fragment or keyframe boundary)
  • Ability to seek in buffer and back buffer without redownloading segments
  • Built-in Analytics
    • Every internal events could be monitored (Network Events,Video Events)
    • Playback session metrics are also exposed
  • Resilience to errors
    • Retry mechanism embedded in the library
    • Recovery actions could be triggered fix fatal media or network errors
  • Redundant/Failover Playlists

Not Supported (Yet)

  • MP3 Elementary Stream in Edge for Windows 10+

Supported M3U8 tags

API and Configuration Parameters

hls.js can be configured and controlled easily, click here for details.

License

hls.js is released under Apache 2.0 License

Contributing

Pull requests are welcome. Here is a quick guide on how to start.

  • First, checkout the repository and install required dependencies
git clone https://github.com/video-dev/hls.js.git
# setup dev environement
cd hls.js
npm install
# build dist/hls.js, watch file change for rebuild and launch demo page
npm run dev
# lint
npm run lint
  • Use EditorConfig or at least stay consistent to the file formats defined in the .editorconfig file.
  • Develop in a topic branch, not master
  • Don't commit the updated dist/hls.js file in your PR. We'll take care of generating an updated build right before releasing a new tagged version.

Design

Click here for details.

Tested With

Browser Stack Logo