This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Natao arisiva ity resaka mitohy ity. Mametraha fanontaniana azafady raha mila fanampiana.

Why doesn't Firefox support my H.264 m4v videos ?

  • 2 valiny
  • 22 manana an'ity olana ity
  • 1 view
  • Valiny farany nomen'i awulb

awulb
awulb
more options

Hello,

It seems that Firefox (on Windows 7 and above, and android) supports H.264 codec for html5 video implementation (since version 20). However, it doesn't work on my own website which delivers H.264 videos (in m4v container).
Indeed, when I navigate on the page containing the html5 video player, I can read the following 'error' message : "Video format or MIME type is not supported".

I am using Firefox 23.0 on Windows 7 (and have tried the nightly version to see if it would work with it).
The used doctype is : <!doctype html> Video files are H.264 encoded in m4v containers (I have also tried mp4 containers but it doesn't work better).

Here is how I use the html5 video tag : 

<video id="main_video" type="video/mp4" src="..." controls="" poster="...">

It is frustrating because H.264 video works well in this sample page : http://www.quirksmode.org/html5/tests/video.html

Any idea how I could solve my problem ?

Thank you !

Hello, It seems that Firefox (on Windows 7 and above, and android) supports H.264 codec for html5 video implementation (since version 20). However, it doesn't work on my own website which delivers H.264 videos (in m4v container).<br /> Indeed, when I navigate on the page containing the html5 video player, I can read the following 'error' message : "Video format or MIME type is not supported". I am using Firefox 23.0 on Windows 7 (and have tried the nightly version to see if it would work with it). <br /> The used doctype is : &lt;!doctype html&gt; Video files are H.264 encoded in m4v containers (I have also tried mp4 containers but it doesn't work better). Here is how I use the html5 video tag : <pre><nowiki> <video id="main_video" type="video/mp4" src="..." controls="" poster="..."></nowiki></pre> It is frustrating because H.264 video works well in this sample page : http://www.quirksmode.org/html5/tests/video.html Any idea how I could solve my problem ? Thank you !

Novain'i cor-el t@

All Replies (2)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

Did you check with which MIME type the server sends the video?

awulb
awulb Tompon'ny fanontaniana
more options

Thank your for this piece of advice. The MIME type is correctly set in the .htaccess server side but I realized the url used for the 'src' attribute in my video tag does not contain the file extension, which seems to be problematic with firefox.