Video buffering in IE/Edge using Media Source Extensions

Confirmed Issue #5800353 • Assigned to Jerry S.


Dec 10, 2015
This issue is public.
Reported by 28 people

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Steps to reproduce


Repro Steps:

Append a ISO BMFF Byte Stream ( frame by frame to a MSE SourceBuffer.

I’ve spent some hours setting up a reproducing example for you. Hope you can take a look and get back to us!

Link to repro:
Download the mp4 here if needed:

This example simulates receiving frames over websocket by having a setTimeout emitting the frames. Hope you can follow the contrived example :)
The example logs the time from first frame is added to the sourcebuffer until the video element starts playing.
When pushing the play button it takes < 30 ms in safari and Chrome on Android. In Chrome on desktop I’m getting around 300 ms. For edge and IE i get above 3200ms, which is not acceptable for live video.

What we would want is a way to make IE start playing when the first frame is appended.

Expected Results:

The video start playing when the first frame is appended to the buffer

Actual Results:

Dev Channel specific:



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    Comments and activity

    • Microsoft Edge Team

      Changed Assigned To to “Venkat K.”

      Changed Assigned To from “Venkat K.” to “Jerry S.”

    • Greetings! Has there been any progress on this issue? Is it being actively worked on?

    • This can also be seen on the following site

    • The reproducing example link is 404, it can be found here instead:

    • Hi, is this issue planned to be fixed in IE & Edge in a near future?
      This feature is critical for our real time project, otherwise our new product won’t be able to support IE & Edge.
      Please, I need to know the status of this issue to adapt our strategy, thanks

    • I have the same problem with MSE on IE and Edge too. They are both delay 3~5 seconds. Any process guys?

    • Microsoft Edge Team

      Changed Status to “Confirmed”

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