Mime Player For Firefox

The following example shows how to embed the Windows Media Player control in a webpage that can be displayed correctly by both Internet Explorer and Firefox. Script on the page detects the browser type and generates the appropriate OBJECT tag. Adobe Flash Player is automatically detected by SeaMonkey, Mozilla Firefox, Opera, Safari and Google Chrome when installed. If Flash Player does not work, see the Top Issues section of the Flash Player FAQ.

• Music Player For Firefox

The video on this webpage works on my tablet's and a 2nd computer's Firefox browsers, but not on my main computer's Firefox.

• Tablet: Android 5.0, Firefox 39
• 2nd PC: Windows 7 x86, Firefox 40.0.3
• Main PC: Windows 7 x64, Firefox 40.0.3

I can't figure out why the video won't play on my main PC. I have done the following:

Music Player For Firefox

1. Made sure that Cisco's OpenH264 video codec is set to 'Always Activate'
2. Disabled all my security addons
3. Restarted Firefox in safe mode (this disables all addons
4. Refreshed Firefox to default state with about:support >> Refresh. This removes all extensions and their data and resets all about:config settings to default

It's always the same thing. In place of the video, I see a grey overlay with the message No video with supported format and MIME type found. The developer's console (CTR+SHIFT+K) shows two warnings

1. Specified 'type' attribute of 'video/mp4' is not supported. Load of media resource test.mp4 failed.
2. All candidate resources failed to load. Media load paused.

I don't know what else to do. Ideas?

Additional Info:

1. The .mp4 file from the page plays normally from the desktop (out of FF)
2. I tried another video with no luck. The .mp4 video on this page throws the same error.

Fixed: Thanks to @karel for pointing me in the right direction. My version of Windows (7 N) lacked some media features that Firefox relies on. I had to install the Windows Media Feature Pack.

1 Answer

You may be needing this in case you do not have support for MP4 files in Firefox:

Windows Media Feature Pack for Windows 7 N and for Windows 7 KN:

Also make sure that these Firefox preferences have the default value. You already tried resetting all about:config settings in Firefox to the default value, but it didn't work.

• media.windows-media-foundation.enabled
• media.directshow.enabled

You can open the about:config page via the location/address bar. You can accept the warning and click 'I'll be careful' to continue.

If you have a similar problem or a problem with a different audio/video codec not playing in Firefox for Windows:

_{Source: Mozilla Support Forum: How can I make mp4 videos play in Firefox?}

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