HTML5 video won't play in Chrome only

some background

I've tested my video in FF and Safari (including iDevices) and it plays properly, but it will not play in the Chrome browser. As you can see in the code below, I've created mp4, m4v, webM, and ogv files, and I've tested all of them on my computer for any playback issues.

the symptoms/issue

In Chrome, the video seems to load, and there are no errors in the console log. When the play button is pressed, it loads a portion of the file, but then does not play it. Yet, interestingly, if I arbitrarily click on a later time in the time-bar, say about halfway through, it will play about 5 seconds of the video even with the subtitles, but no audio.

my research

I've read up on any issues that might be causing this, but I haven't found any ideas that work. To note, I've written the following in my .htaccess file:

# ----------------------------------------------------------------------
# Proper MIME type for all files
# ----------------------------------------------------------------------

# Audio
AddType audio/ogg                      oga ogg
AddType audio/mp4                      m4a
AddType audio/webm                     webm

# Video
AddType video/ogg                      ogv
AddType video/mp4                      mp4 m4v
AddType video/webm                     webm

# Assorted types
AddType image/x-icon                        ico
AddType image/webp                          webp
AddType text/cache-manifest                 appcache manifest
AddType text/x-component                    htc
AddType application/x-chrome-extension      crx
AddType application/x-opera-extension       oex
AddType application/x-xpinstall             xpi
AddType application/octet-stream            safariextz
AddType application/x-web-app-manifest+json webapp
AddType text/x-vcard                        vcf
AddType text/plain                          srt

Also, I am using the mediaelement.js library.

the code

Here's the HTML:

<video width="100%" height="400" poster="assets/img/myVideo.jpg" controls="controls" preload="none">
      <!-- M4V for Apple -->
      <source type="video/mp4" src="assets/vid/PhysicsEtoys.m4v" />
      <!-- MP4 for Safari, IE9, iPhone, iPad, Android, and Windows Phone 7 -->
      <source type="video/mp4" src="assets/vid/PhysicsEtoys.mp4" />
      <!-- WebM/VP8 for Firefox4, Opera, and Chrome -->
      <source type="video/webm" src="assets/vid/PhysicsEtoys.webm" />
      <!-- Ogg/Vorbis for older Firefox and Opera versions -->
      <source type="video/ogg" src="assets/vid/PhysicsEtoys.ogv" />
      <!-- Subtitles -->
      <track kind="subtitles" src="assets/vid/subtitles.srt" srclang="en" />
      <track kind="subtitles" src="assets/vid/subtitles.vtt" srclang="en" />
      <!-- Flash fallback for non-HTML5 browsers without JavaScript -->
      <object width="100%" height="400" type="application/x-shockwave-flash" data="flashmediaelement.swf">
          <param name="movie" value="flashmediaelement.swf" />
          <param name="flashvars" value="controls=true&file=assets/vid/PhysicsEtoys.mp4" />
          <!-- Image as a last resort -->
          <img src="assets/img/myVideo.jpg" width="320" height="240" title="No video playback capabilities" />
      </object>
</video>

Here's the simple js:

$('video,audio').mediaelementplayer({
    features: ['playpause','progress','current','tracks','volume'],
    startLanguage: 'en'
});

Any ideas?

Thanks for any and all help in this matter!

With some help from another person, we figured out it was an issue of ordering the source files within the HTML file. I learned that browsers accept the first usable format, and their seems to be an issue with the .m4v file, so I started with the .mp4, then .webm. Here's the order that works in Safari (even on my iPhone 5), Firefox, and Chrome:

<video width="100%" height="400" poster="assets/img/myVideo.jpg" controls="controls" preload="none">
      <!-- MP4 for Safari, IE9, iPhone, iPad, Android, and Windows Phone 7 -->
      <source type="video/mp4" src="assets/vid/PhysicsEtoys.mp4" />
      <!-- WebM/VP8 for Firefox4, Opera, and Chrome -->
      <source type="video/webm" src="assets/vid/PhysicsEtoys.webm" />
       <!-- M4V for Apple -->
      <source type="video/mp4" src="assets/vid/PhysicsEtoys.m4v" />
      <!-- Ogg/Vorbis for older Firefox and Opera versions -->
      <source type="video/ogg" src="assets/vid/PhysicsEtoys.ogv" />
      <!-- Subtitles -->
      <track kind="subtitles" src="assets/vid/subtitles.srt" srclang="en" />
      <track kind="subtitles" src="assets/vid/subtitles.vtt" srclang="en" />
      <!-- Flash fallback for non-HTML5 browsers without JavaScript -->
      <object width="100%" height="400" type="application/x-shockwave-flash" data="flashmediaelement.swf">
          <param name="movie" value="flashmediaelement.swf" />
          <param name="flashvars" value="controls=true&file=assets/vid/PhysicsEtoys.mp4" />
          <!-- Image as a last resort -->
          <img src="assets/img/myVideo.jpg" width="320" height="240" title="No video playback capabilities" />
      </object>
  </video>

Now, I'll have to re-check the encoding on the m4v file (perhaps an issue of Baseline vs Main, High, etc.).