MP4 videos refuse to play.

I have updated my plugins and extensions multiple times to no avail. I have accelerate hardware unchecked. I just cannot get MP4 videos to play, regardless the site.

Is a Flash player used on the HTML5 media player if you check that via the right-click context menu?
You can check the media prefs on the <b>about:config</b> page to see if the HTML5 media player is enabled.
*media.windows-media-foundation.enabled
*media.directshow.enabled
Are there any errors in the Web Console (Firefox/Tools > Web Developer)?
*https://developer.mozilla.org/Tools/Web_Console

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    Thanks a lot for your reply. I do have gstreamer0.10-ffmpeg installed; I believe it's included in the gstreamer0.10-plugins group and just double-checked and it's there. I also just tried changing the extension to .m4a as you suggested but no luck; same error message.
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