Only "h.264" and "MSE and h.264" are disabled in the html5 player support youtube video.

I spotted this problem just after I installed Windows 10 and still have not been able to understand why. I did some research on google, but none of them was the case for firefox 39 (and 40.0 because I've just updated!) and Windows 10.

What I think is that Firefox has an open H.264 codec built-in so I have need additional facilities or tweaks to enable h.264 support during the recent generation. However, even though I clearly see the codec installed in the plugin list, it seems that something is missing in my Firefox accroding to the support page.

I already tried to clean reinstall it and even checked on the mode safe but had no luck so far. I wish I could get help or advice. Thanks in advance!

In fact... Firefox needs the Windows Media Foundation to decode H.264.

First of all, let's see if there is a problem with YouTube only: you can play H.264 video on this test page: http://www.quirksmode.org/html5/tests/video.html

If this does not work on any site, you may have a version N or KN of Windows that does not have the Media Feature Pack bundled in? Please visit: https://www.microsoft.com/en-us/download/details.aspx?id=48231

Tags: Firefox

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