Can't play m4v videos in Firefox.

Hello. I was hoping that someone could help me with a problem. I have an html presentation for a course I teach. (I did not create the presentation.) It includes m4v videos and I cannot get them to play in Firefox. It says "No video with supported format and MIME type found. I can play the videos if I open them externally, but I need it to work in the presentation. Please help. Thank you.

Firefox can't play files with the .m4v file extension via the audio or video tag as those are not one of the supported file extensions. You can only play such files via the object tag to make Firefox use a plugin that supports this file extension. You can force to use a specific plugin by specifying a type (type="application/x-mplayer2").
<pre><nowiki><object data="file://<path to file>" type="<to force a specific plugin>"></object></nowiki></pre>

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