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Vine and other HTML5 videos won't play

Note: This article only applies to Windows.

Some HTML5 videos (especially Vine videos) won't play on Windows. You can quickly work around this issue by changing a Windows Media setting.

  1. In the address bar, type about:config and press EnterReturn.

    • The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise!I accept the risk! to continue to the about:config page.
  2. Search for:
  3. Double-click the setting to change its value to false.
  4. Finally, reload the page with the video and it will work.

This workaround should cause the website to give you a Flash video. If you don't have Flash installed, see Install the Flash plugin to view videos, animations and games.


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I was wondering what the background was on this new KB article. I found this at MozillaZine (issue: vine video links display as a still image):

"MarkRH" Posted 07 Aug 2013 (page 1)

Hmmm you know. Vine videos were working for me (in FF22) and then recently they quit and just show a single image (while I was still on FF22). Hmm..
Well, it looks like Firefox's HTML5 player is the reason (or part of it). If I set to false then they will play. Well, at least the one at will play. I found this thread: Apparently they changed the codec or something with their videos and the HTML5 player can't decode it or figure out what to do. However, if I access the video directly: Then it will play in Firefox using it's built-in player (with the above setting at "true"). Hmmm..

"MarkRH" Posted 07 Aug 2013 (page 2)

Well, I did some testing with my own webpage using the Vine video as the source. Firefox and the OS are able to decode and play the video fine. The problem seems to be how the <video> tag is coded. If you look here: There is no play button that you can click on to start playing the video. You also can't right click and select "play" due to the overlaying elements. If the <video> tag had the "autoplay" attribute then the video would start playing automatically. The JavaScript is supposed to let you click on the image to start playing it. This only seems to work when Adobe Flash is playing it. When HTML5 H.264 is disabled, that Vine page plays the video using Adobe Flash instead which seems to autoplay it without the need for hitting a play button. So technically I don't know if this is really a Firefox bug or not.

Note that the linked SUMO thread (issue: video shows as a static image) was posted on Jun 8 2013, by a Windows 7 Firefox 21 user:

(For the record)

Additional info posted today to /questions/961627?page=2 by Firefox user nyet

This is apparently fixed according to the latest comments on the related bug,

AliceWyman said

This is apparently fixed according to the latest comments on the related bug,

I'm archiving this. See also /questions/961627?page=3#answer-506751 posted 11/29/2013 Looks like vine fixed it on their end, finally.