MP4 streaming in IE11 does not work any more - requires moov

Won’t fix Issue #11148189


Marcus N.
Mar 3, 2017
This issue is public.
Found in
  • Internet Explorer
Found in build #
Reported by 1 person

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Steps to reproduce


IE11 on Win7 with build 11.0.9600.18537 does not play mp4 files without moov atom, which end up making native streaming of mp4 non functional.
IE11 reports “Invalid Source” on these videos. All other browers tested OK.

See attached videos, one with moov and one without.

Steps to reproduce:

Create a html file with video tags for each video attached and open it in IE11:

    <!DOCTYPE html>

    <video width="320" height="240" autoplay controls>
            <source src="test_with_moov.mp4" type="video/mp4">

    <video width="320" height="240" autoplay controls>
            <source src="test_empty_moov.mp4" type="video/mp4">


Browsers tested on the same machine (Win7)

NOT WORKING means test_with_moov.mp4 are playing in the software, while test_empty_moov.mp4 is not playing.

WORKING means both test_with_moov.mp4 and test_empty_moov.mp4 are playing in the software.

Internet Explorer 1111.0.9600.18537NOT WORKING
Google Chrome56.0.2924.87WORKING
Windows Media Player12.0.7601.23517NOT WORKING

Tests were done on Win7 SP1 CurrentBuildNumber 7601.

Tested OK in IE11 on Windows 10

The same files are confirmed working in Windows 10 E N 2015 LTSB with Media Feature Pack (build: 11.0.10240.17202) and Internet Explorer 11 build 11.0.10240.17202.


Comments and activity

  • Microsoft Edge Team

    Changed Assigned To to “James M.”

    Changed Status to “Won’t fix”

  • Hello,

    Thank you for providing your feedback on IE11. We are not accepting feedback on Internet Explorer through this portal any longer (unless security related). We welcome any feedback you have on Microsoft Edge through this website.

    Best Wishes,
    The MS Edge Team

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