Media Source Extensions

Media Source Extensions (MSE) is a W3C specification that allows JavaScript to send byte streams to media codecs within Web browsers that support HTML 5 video and audio.[1] Among other possible uses, this allows the implementation of client-side prefetching and buffering code for streaming media entirely in JavaScript. It is compatible with, but should not be confused with, the Encrypted Media Extensions specification, and neither requires the use of the other. (Note: It appears that EME does REQUIRE the use of MSE).

Netflix announced experimental support in June 2014 for the use of MSE playback on the Safari browser on the OS X Yosemite beta release.[2]

YouTube started using MSE with its HTML 5 player in September 2013.

Browser support

  • Firefox 42 with support for all sites since 3 November 2015,[3] with a subset of the functionality available for use with only YouTube in Firefox 37 on Windows Vista or later only.[4] Firefox added the same subset of MSE for YouTube playback support to Mac OS X starting in Firefox 38.[5]
  • Google Chrome since early 2013, also on Android.[6]
  • Internet Explorer from version 11 on Windows 8.1. (2013 October)[6]
  • Microsoft Edge since its launch in November 2015.[7]
  • Opera since 9 June 2015.[8]
  • Pale Moon from version 27.0, since 22 November 2016.[9]
  • Safari 8 on OS X.[6]


  • NexPlayer for HTML5 MSE and EME supporting HLS and DASH
  • castLabs PRESTOplay video player for HMTL5 MSE and EME supporting DASH and HLS
  • Akamai Media Player as a contributor to the Dash Industry Forum and DASH.js (DASH IF reference client). AMP includes Dash.js, HLS.js and advanced QUIC protocol playback from Akamai Edge Servers.
  • Shaka Player, an open source javascript player library for HTML5 MSE and EME video with DASH and HLS support[10][11]
  • The Video Player by Comcast Technology Solutions
  • THEOplayer by OpenTelly: HLS and MPEG-DASH player for cross-platform HTML5 support without the need for Flash fallback[12]
  • Viblast Player: HLS and MPEG-DASH player for HTML5 MSE and EME, with Flash fallback[13]
  • bitmovin's bitdash MPEG-DASH player for HTML5 MSE and EME, with Flash fallback[14]
  • dash-js for HTML5 MSE[15]
  • dash.js for HTML5 MSE and EME[16]
  • rx-player for HTML5 MSE and EME (Live and On Demand)[17]
  • hls.js for HTML5 MSE[18][19]
  • hasplayer.js for HTML5 MSE and EME, supporting DASH, Smooth Streaming and HLS[20]
  • JW Player 7 and later for MPEG-DASH using HTML5 MSE and EME[21]
  • SLDP HTML5 Player supports SLDP via MSE playback[22]
  • Azure Media Player supports MSE, EME, DASH, HLS, Flash, and Silverlight. Streaming URLs are published in an ism/manifest.[23]
  • Unreal HTML5 player uses MSE for low latency (sub-second) live playback of streams sent via WebSockets by Unreal Media Server[24]

See also


  1. "Media Source Extensions W3C Candidate Recommendation". 17 July 2014. Retrieved 20 November 2014.
  2. Anthony Park and Mark Watson (3 June 2013). "HTML5 Video in Safari on OS X Yosemite". Netflix.
  3. "Firefox 42.0, See All New Features, Updates and Fixes". Mozilla.
  4. "Firefox 37.0, See All New Features, Updates and Fixes". Mozilla.
  5. "Firefox 38.0, See All New Features, Updates and Fixes". Mozilla.
  6. The Status of MPEG-DASH today, and why Youtube & Netflix use it in HTML5
  7. McCormick, Libby. "Media Source Extensions (MSE) (Windows)".
  8. "Dev.Opera — Opera 30 released".
  9. "Pale Moon - Release Notes".
  10. "JavaScript player library / DASH & HLS client / MSE-EME player: google/shaka-player". March 24, 2019 via GitHub.
  11. "Shaka Player Demo".
  12. NV, THEO Technologies. "THEOplayer – Universal Video Player".
  13. "Viblast Player".
  14. "HTML5 Player for Adaptive Streaming from Bitmovin". Bitmovin. January 22, 2016.
  15. "DASH-JS | ITEC – Dynamic Adaptive Streaming over HTTP".
  16. "A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.: Dash-Industry-Forum/dash.js". March 23, 2019 via GitHub.
  17. "GitHub - canalplus/rx-player: Smooth/DASH HTML5 Video Player". March 21, 2019 via GitHub.
  18. "dailymotion – Medium". Medium.
  19. "hls.js demo page".
  20. "Http Adaptive Streaming javascript player based on HTML5 premium extensions (MSE/EME): Orange-OpenSource/hasplayer.js". February 20, 2019 via GitHub.
  21. "JW Player Support". JW Player Support.
  22. "HTML5 player for SLDP". Softvelum.
  23. "Azure Media Player". Microsoft. 2015. Retrieved 2016-06-14.
  24. "Unreal Media Server".
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