cancel
Showing results for 
Search instead for 
Did you mean: 

HTML 5 videos (like Vine) won't play

SOLVED
Highlighted
New User

HTML 5 videos (like Vine) won't play

Some HTML5 videos won't play in my Firefox browser.

This vine for example (https://vine.co/v/b3v5h3Piwt7) only shows up as a static image. I can click the mute/audio button though, but it won't play. When I look at the webconsole when I load the page then 2 javascript warnings show up, the first one say that the Mediasource [long url here] can't be encoded and another one says loading of all candidate sources failed. loading media paused.

I'm using Firefox 21.0 and I tried to run Firefox in safe mode with disabled add-ons, and I also tried to reinstall it, but without success.

Thanks in advance.

1 ACCEPTED SOLUTION

Accepted Solutions
Site Moderator

Re: HTML 5 videos (like Vine) won't play

You can try to set the media.windows-media-foundation.enabled pref to false on the about:config page to disable the built-in mp4 media player.

45 REPLIES
Site Moderator

Re: HTML 5 videos (like Vine) won't play

You can try to set the media.windows-media-foundation.enabled pref to false on the about:config page to disable the built-in mp4 media player.

New User

Re: HTML 5 videos (like Vine) won't play

The about:config change did not work for me. Many vines (but not all!) don't play. Firefox 22. Latest Flash (if that matters). Tried on Windows 8, Windows 7 and Windows XP! (3 different computers, 2 different networks).

Here's another one that fails: https://vine.co/v/huHUPLnx1dg

Grabbing one at random from vine roulette--here's one that works fine:

https://twitter.com/marion_okuyama/statuses/360692023075938305

What's the difference???

Site Moderator

Re: HTML 5 videos (like Vine) won't play

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/Tools > Add-ons > Appearance).

  • Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.

You can also check the cookie settings.

Clear the cache and the cookies from websites that cause problems.

"Clear the Cache":

  • Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

  • Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"
New User

Re: HTML 5 videos (like Vine) won't play

Thanks. Tried safe mode--it worked! Once! Went out of safe mode and it didn't work. Clear cache, went back into safe mode--and it STILL didn't work. Weird. Now, nothing--no combination of safe mode, deleting history (including cookies) fixes it. Even finally reset my settings my firefox settings to default. No go.

A good test site for the issue is microsoft's "The browser you love to hate" site. It has about 7 vines half way down. One ALWAYS works. The rest, never work. http://www.browseryoulovedtohate.com/

What is up with this. As I said before, this occurs on multiple computers, Win 7, Win 8, XP. Different networks.

My big question is--Am I the only one seeing it? You guys are fine on those sites with the Vines? And if so--are you running Windows?

Site Moderator

Re: HTML 5 videos (like Vine) won't play

Does it work in a Private Browsing mode window?

New User

Re: HTML 5 videos (like Vine) won't play

No, same behavior in Private Browsing.

I can clear cookies on the page or force it to ask to set cookies or only allow during the session. That--combined with clearing the history and restarting Firefox -sometimes- seems to work--but without changing a thing, trying the site again fails once more--even when doing the same steps.

Going crazy! Since it happens on my other computers too--I'd appreciate a response on one thing: Can you go to: www.browseryoulovedtohate.com and see ALL the Vines (they are about midway down the page) with no problem? And--if you then close Firefox, and go back, can you STILL see them? (And--what platform are you on?)

Thanks!

Site Moderator

Re: HTML 5 videos (like Vine) won't play

What are your cookie setting?

Do you allow all cookies or are you using another setting like "Ask me..."?
If you are using "Ask me" then try try to allow cookies for the current session (Keep until: I close Firefox)

Do you have any extensions that deal with cookies?

New User

Re: HTML 5 videos (like Vine) won't play

I've tried all the combinations of cookie settings, both on the pages themselves, and in my firefox history settings. Blocking all, allowing all, session only, exceptions for the sites in question, make no difference.

And no extensions at all that deal with cookies. And, if I run in safe mode, it doesn't work (most of the time--strangely, it can sometimes work once but even if I go back in safe mode, it doesn't work the 2nd time).

DOES it work WORK for YOU?

New User

Re: HTML 5 videos (like Vine) won't play

And if it does work for you, are you on Windows?