How to play wmv files in html5 video player

That's not true. Wmv files CAN play in IE with the windows media player object.

Example:

<object classid="clsid:22D6F312-B0F6-11D0-94AB-0080C74C7E95" width="480"
        height="360" codebase="http://www.microsoft.com/Windows/MediaPlayer/">
   <param name="Filename" value="http://walkernewsdownload.googlepages.com/HP-iPaq-614.wmv">
   <param name="AutoStart" value="true">
   <param name="ShowControls" value="true">
   <param name="BufferingTime" value="2">
   <param name="ShowStatusBar" value="true">
   <param name="AutoSize" value="true">
   <param name="InvokeURLs" value="false">
   <embed src="http://walkernewsdownload.googlepages.com/HP-iPaq-614.wmv"
          type="application/x-mplayer2" autostart="1" enabled="1" showstatusbar="1"
          showdisplay="1" showcontrols="1" 
          pluginspage="http://www.microsoft.com/Windows/MediaPlayer/" 
          CODEBASE="http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=6,0,0,0" width="480" height="360"></embed>
</object>

You might need to install the Windows Media Player plug-in for your browser (if it is still available for your browser)

Credit: See http://www.walkernews.net/2008/08/17/windows-media-player-how-to-embed-wmv-file-in-html-code/ for a more thorough explanation.

Mediaelement.js player documentation says, support to wmv and mov, but so far i have not seen any positive or success comments for these formats.Formats like wmv and mov are proprietary, so to play video user need to explicitly install browser based plugins. Latest version of Firefox doesn't support wmv directly, there is a work around.To support mov format,user need to have quicktime player install in the system.Go for players that supports Flash fallback for non HTML5 browsers.

WMV plugin for firefox

Firefox Documentation:

There is no way. No browser (currently, if ever) supports playing wmv files. You will have to convert it into a format that browsers know how to play.

AFAIK, the only way to play WMV files in a browser without resorting to embedding WMP is using Silverlight.