Many WebM videos still don't work in Edge 16 / Fall Creators Update 16299.19

Needs root cause Issue #14287047 • Assigned to Erik A.


Vladimir N.
Oct 18, 2017
This issue is public.
Found in
  • Microsoft Edge
Found in build #
Needs root cause
Sign in to suggest a root cause.
Reported by 4 people

Sign in to watch or report this issue.

Steps to reproduce

To reproduce the issue visit . The video at the bottom will say "This type of video file is not supported".

So, some progress has been made in Edge 16, but still around 50% of the WebM videos I find on the web don’t work.

Furthermore still reports that WebM is not supported by Edge 16.


0 attachments

    Comments and activity

    • Microsoft Edge Team

      Changed Assigned To to “James M.”

    • Also, still a problem on 64-bit Edge. I tested both a VP8 and a VP9 and both fail. (This is my SECOND complaint on this issue…the first was back in April.)
      I’m testing using Fall Creators Update. The version # is
      Microsoft Edge 41.16299.15.0
      Microsoft EdgeHTML 16.16299

      I’m really p*ssed that this still doesn’t work. I went out of my way after posting here back in April, to get the info on wikipedia changed from green (supported) to pale yellow (only via MSE) in the chart here:
      And, I’m gonna continue to be on your case, until you implement this
      correctly. To re-create the issue, simply take any standard MP4 video
      (e.g. H.264/MP3) and convert it using the FFMEG conversion program
      and watch them both fail.

      Do you at least agree that these are valid test images?

    • I’m guessing the problem is that Vorbis audio is still not supported:

      If that’s the problem, I would expect to at least play the video, without audio, but it doesn’t.

    • Microsoft Edge Team

      Changed Assigned To to “Venkat K.”

    • We are experiencing the same issue with webm. Please provide an update as to when this will be fixed.

    • Microsoft Edge Team

      Changed Assigned To from “Venkat K.” to “Erik A.”

      Changed Status to “Needs root cause”

    • Hmm…I’ve resolved my major roadblock to getting my WEBM-based markup working in Microsoft Edge 41.16299.15.0. The markup

      fails. But, simply removing the type-attribute specification allows the content to be correctly rendered. Or, eliminating use of a source tag altogether, and using just the video tag (where no type-attribute is allowed) resolves the issue.

      One other issue is that needs work is support VTT-support, so that

      is honored.

    • is erroneously flagged as invalid source.

    • Do you allow a source-tag with type of video-slash-mp4 ? (yes)

      how about one with type of video-slash-webm ? (no)

      therein lies a problem.

    You need to sign in to your Microsoft account to add a comment.

    Sign in