How do I make h.264 work on YouTube on Firefox on Windows 7 64 bit?

Posted by Ansis Malins on Super User See other posts from Super User or by Ansis Malins
Published on 2013-10-26T10:33:36Z Indexed on 2013/10/29 10:01 UTC
Read the original article Hit count: 311

Filed under:

firefox

|

youtube

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h.264

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html5

Various news articles state that Firefox supports h.264 on Windows since version 20. As of this writing the version is 24, yet Firefox still can't play most YouTube videos. I did the HTML5 opt-in and tested both Firefox and Nightly. I also made sure media.windows-media-foundation.enabled in about:config is enabled, and it is by default both on Firefox and Nightly.

What's wrong and how do I fix it?

Edit:
This video works.
This video fails.
They're both MP4 (right click video -> stats for nerds), so Firefox's h.264 support works at least some of the time.

Edit:
When I go to a YouTube video that doesn't work, click Share -> Embed and then copy-paste the src of the iframe tag into the address bar, the video works.

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