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MIME type not found (MP4)

  • 3 replies
  • 1 has this problem
  • 15 views
  • Last reply by jonzn4SUSE

Michael
Michael
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Windows 11 Pro - Dell XPS8940 desktop - i9

Firefox will not play video from a website. If I save the video, it is a MP4 file. Windows Media Player and VLC will play the video file. But the browser shows the message: "No video with supported format and MIME type found."

Chrome and Edge will play this video correctly in their browsers. Firefox will not play the video on 3 different computers, and even when a different user account is involved (without Firefox sync).

The evidence seems to point at firefox. The website is a Wordpress site.

Is it possible that the website is the problem? If so, why do Edge and Chrome work?

I uninstalled Firefox (latest version) and reinstalled it. Not fixed.

My windows updates are current, as are Dell updates.

This is stumping me. I hope someone can help.

Windows 11 Pro - Dell XPS8940 desktop - i9 Firefox will not play video from a website. If I save the video, it is a MP4 file. Windows Media Player and VLC will play the video file. But the browser shows the message: "No video with supported format and MIME type found." Chrome and Edge will play this video correctly in their browsers. Firefox will not play the video on 3 different computers, and even when a different user account is involved (without Firefox sync). The evidence seems to point at firefox. The website is a Wordpress site. Is it possible that the website is the problem? If so, why do Edge and Chrome work? I uninstalled Firefox (latest version) and reinstalled it. Not fixed. My windows updates are current, as are Dell updates. This is stumping me. I hope someone can help.
Attached screenshots

All Replies (3)

Paul
Paul
  • Moderator
  • Top 10 Contributor
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Hi Michael

To help us to look into this, please can you share a link to the page where we can try to view that video?

Helpful?

Michael
Michael Question owner
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The videos that I am trying to view are in a secure area requiring login. I dug further into the issue and looked for any videos that are not in the secured area. I found one and it played correctly.

So maybe is looks like it may be something to do with the wordpress security module.

I'm not a liberty to give you access to the secure area. I can run some tests and collect information. Let me know what I need to do.

Mike

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jonzn4SUSE
jonzn4SUSE
  • Top 10 Contributor
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What version of Firefox? Can you play video on this site? https://thehighwire.com/watch/

What security software are you running besides MS Defender? You should have Windows Sandbox enabled for testing. https://www.howtogeek.com/399290/how-to-use-windows-10s-new-sandbox-to-safely-test-apps/

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