HTML5 video won't play in Chrome only

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.).

Try this

<video autoplay loop id="video-background" muted plays-inline>            <source src="https://player.vimeo.com/external/158148793.hd.mp4?s=8e8741dbee251d5c35a759718d4b0976fbf38b6f&profile_id=119&oauth2_token_id=57447761" type="video/mp4">            </video>

Thanks

I had a similar issue, no videos would play in Chrome. Tried installing beta 64bit, going back to Chrome 32bit release.

The only thing that worked for me was updating my video drivers.

I have the NVIDIA GTS 240. Downloaded, installed the drivers and restarted and Chrome 38.0.2125.77 beta-m (64-bit) starting playing HTML5 videos again on youtube, vimeo and others. Hope this helps anyone else.