i try to make a Javascript where I need to test the ability of playing "video/mp4".

I do that with:

var video = document.createElement('video');

But my Firefox (Version 25.0 / Ubuntu 13.10) returns empty string.

According the Bug I opend on bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=934947

(second comment)

I need to enable gstreamer.

But I dont't know how to do that.


O.K. found it out my self. Answer:

Go to


(Say yes to warranty warning). Search for gstreamer and change enabled/fals to enabled/true

Thats it.

  • This also worked for the SoundCloud playback problem I was having. Thanks for replying to your own question with this solution. :) – Alex Hirzel Jul 21 '14 at 13:52

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