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MIME type not found (MP4)

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 … (read more)

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.

Asked by Michael 13 hours ago

Last reply by jonzn4SUSE 10 hours ago

System Freeze when using Picture-in-Picture simultaneously with other applications.

Hello. For a while now I have been using the picture-in-picture feature to play a video in the corner while using other applications. It has been a great help as I have a… (read more)

Hello. For a while now I have been using the picture-in-picture feature to play a video in the corner while using other applications. It has been a great help as I have a single monitor.

Unfortunately, I have recently been encountering a severe issue with the feature over the last week. When attempting to use picture-in-picture while my computer is running a videogame (through Steam) my entire system will freeze. The audio still plays as normal, but the image is frozen and the system is unresponsive until I force a shutdown and reboot.

Any help at all in with this issue would be greatly appreciated, thank you.


Hardware Specs: GPU AMD Radeon RX 6750 XT CPU AMD Ryzen 5 5600X 6-Core Processor 3.70 GHz RAM 16.0 GB OS Windows 11 Home

Asked by randomreef 1 day ago

Last reply by jonzn4SUSE 1 day ago

Japanese IME makes double input on iCloud Memo.

Hello developers; I have used Firefox for long time on both Mac and Windows. Recently, I have been experiencing the phenomenon described above, i.e., when entering Japa… (read more)

Hello developers;

I have used Firefox for long time on both Mac and Windows.

Recently, I have been experiencing the phenomenon described above, i.e., when entering Japanese text into iCloud Memo on Firefox, it appears as a double character. I'm sorry but I haven't taken screen shot.

This is the same on both Mac and Windows. It does not depend on the Japanese input method (IME). Refresh and reinstallation did not resolve the issue. Finally, I reverted to the previous version and the phenomenon was resolved.

From the above, we assume that the problem is caused by some kind of recovery in the latest version.

Thank you in advance for your confirmation and response.

...Translated with DeepL.com (free version)

Asked by ShuKuzu 3 weeks ago

Last reply by kleiber 3 days ago