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Trying to play mp4 video, have VLC and VLC plug-in upto date, but it won't play- just hangs (Win XP)

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New Contributor

Trying to play mp4 video, have VLC and VLC plug-in upto date, but it won't play- just hangs (Win XP)

Space for video screen opens, but controls don't work, it just sits there.

24 REPLIES
Site Moderator

Re: Trying to play mp4 video, have VLC and VLC plug-in upto date, but it won't play- just hangs (Win XP)

What do you see if you right-click the player?

Firefox can play MP4 files natively with an HTML5 media player if the video element is used instead of the object or embed element.

You can try to set the media.directshow.enabled pref to false on the about:config page to disable the HTML5 media player.

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

New Contributor

Re: Trying to play mp4 video, have VLC and VLC plug-in upto date, but it won't play- just hangs (Win XP)

The page opens with a VLC logo in the center. No clicking works. The controls at bottom don't work. The only thing that works is maximizing the page to full screen.

In about.confg, there are only three references to htlm5, two to flush and one to offline... none seems to refer to disabling the html5 player.

Thanks for the reply!!

New Contributor

Re: Trying to play mp4 video, have VLC and VLC plug-in upto date, but it won't play- just hangs (Win XP)

Further, trying toggling the "media directshow" to disabled made no discernible difference except the background of the video-ready page turned from black to white...

Thanks again!

New Contributor

Re: Trying to play mp4 video, have VLC and VLC plug-in upto date, but it won't play- just hangs (Win XP)

Since this question is not drawing any solutions, could somebody please indicate how to submit this problem to Firefox as a bug? Thanks!

Legendary Contributor

Re: Trying to play mp4 video, have VLC and VLC plug-in upto date, but it won't play- just hangs (Win XP)

There's a nice article on how to write a bug report here: https://developer.mozilla.org/docs/Mozilla/QA/Bug_writing_guidelines

Are you getting a plugin notification on the address bar for VLC (looks like a piece of Lego)? If so, is VLC allowed to run on that site or does it need permission to run?

New Contributor

Re: Trying to play mp4 video, have VLC and VLC plug-in upto date, but it won't play- just hangs (Win XP)

First, I usually get a "Warning: Unresponsive plugin" message window to come up. If it does come up, after a few moments the message window disappears, and a full screen shows up with the VLC logo in the center, background is black. The start video button at the bottom of the screen appears, and it seems to click, but nothing happens...

Legendary Contributor

Re: Trying to play mp4 video, have VLC and VLC plug-in upto date, but it won't play- just hangs (Win XP)

From your description, it sounds like VLC can start up, but it is having a problem reading media or otherwise interacting with Firefox.

In case one of your extensions is involved, could you test the page in Firefox's Safe Mode? That's a standard diagnostic tool to deactivate extensions and some advanced features of Firefox. More info: Troubleshoot Firefox issues using Safe Mode.

You can restart Firefox in Safe Mode using either:

  • "3-bar" menu button > "?" button > Restart with Add-ons Disabled
  • Help menu > Restart with Add-ons Disabled

Not all add-ons are disabled: Flash and other plugins still run

After Firefox shuts down, a small dialog should appear. Click "Start in Safe Mode" (not Reset).

Any difference?

New Contributor

Re: Trying to play mp4 video, have VLC and VLC plug-in upto date, but it won't play- just hangs (Win XP)

Other than the steps occur slower than before, no difference. The "Unresponsive plugin" comes up, click continue, eventually the black screen with the VLC logo comes up, but the buttons are unresponsive. So I guess no conflict with an extension?

Many thanks!

Legendary Contributor

Re: Trying to play mp4 video, have VLC and VLC plug-in upto date, but it won't play- just hangs (Win XP)

Any idea what kind of media VLC is trying to play? I don't use VLC.

If it is MP4 video, have you considered having Firefox play it directly (using the DirectShow feature of Windows XP)? You might have disabled this at some point in order to facilitate downloading MPEG-encoded media.