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Embedded video is black but with audio, but the video works fine on youtube.


I'm having trouble with firefox not been able to display embedded video on sites. I see the preview image but when i start play all video area becomes black and I can hear the audio playing. I also can pause the "video".

If I start firefox in safe mode, it works. I have deactivated all my extensions/add-ons, without any success. I have reset all cache, no success I have restored to factory result, no success I have uninstalled firefox, and deleting all local data and reinstalled firefox, still same problems.

I have tested to go to http://www.youtube.com/html5 and activated the html5 player, and then I see the play button, progressbar and volume etc, but still no video.

The video is working fine in IE 9 and Chrome (unknown version, but since it autoupdates it's probably the latest)

Yderligere systemdetaljer

Installerede plugins

  • Shockwave Flash 11.6 r602
  • Google Update
  • Next Generation Java Plug-in 10.9.2 for Mozilla browsers
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • iTunes Detector Plug-in
  • Microsoft Lync 2010 Meeting Join Plug-in
  • 5.1.10411.0
  • wpidetector
  • Windows Activation Technologies Plugin for Mozilla
  • Foxit Reader Plug-In For Firefox and Netscape
  • The plug-in allows you to open and edit files using Microsoft Office applications
  • Office Authorization plug-in for NPAPI browsers


  • Firefox 19.0
  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0
  • Support-URL: http://support.mozilla.org/1/firefox/19.0/WINNT/sv-SE/


  • Troubleshooter 1.0a (troubleshooter@mozilla.org)
  • Skype Click to Call ({82AF8DCA-6DE9-405D-BD5E-43525BDAD38A}) (Inactive)


  • incrementalGCEnabled: True


  • adapterDescription: Intel(R) HD Graphics
  • adapterDescription2: NVIDIA NVS 3100M
  • adapterDeviceID: 0x0046
  • adapterDeviceID2: 0x0a6c
  • adapterDrivers: igdumd64 igd10umd64 igdumdx32 igd10umd32
  • adapterDrivers2: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
  • adapterRAM: Unknown
  • adapterRAM2: 512
  • adapterVendorID: 0x8086
  • adapterVendorID2: 0x10de
  • direct2DEnabled: True
  • directWriteEnabled: True
  • directWriteVersion: 6.1.7601.17789
  • driverDate: 8-25-2010
  • driverDate2: 6-27-2010
  • driverVersion:
  • driverVersion2:
  • info: {u'AzureContentBackend': u'direct2d', u'AzureCanvasBackend': u'direct2d', u'AzureFallbackCanvasBackend': u'cairo'}
  • isGPU2Active: False
  • numAcceleratedWindows: 1
  • numTotalWindows: 1
  • webglRenderer: Google Inc. -- ANGLE (Intel(R) HD Graphics)
  • windowLayerManagerType: Direct3D 10

Ændrede indstillinger

  • accessibility.typeaheadfind.flashBar: 0
  • browser.cache.disk.capacity: 358400
  • browser.cache.disk.smart_size.first_run: False
  • browser.cache.disk.smart_size.use_old_max: False
  • browser.cache.disk.smart_size_cached_value: 358400
  • browser.places.smartBookmarksVersion: 4
  • browser.startup.homepage_override.buildID: 20130215130331
  • browser.startup.homepage_override.mstone: 19.0
  • extensions.lastAppVersion: 19.0
  • gfx.direct3d.prefer_10_1: True
  • network.cookie.prefsMigrated: True
  • places.history.expiration.transient_current_max_pages: 102018
  • plugin.disable_full_page_plugin_for_types: application/pdf
  • privacy.sanitize.migrateFx3Prefs: True


  • User JS: Nej
  • Tilgængelighed: Nej
  • Top 10 Contributor
416 løsninger 4930 svar

Check our the common problem in audio

Nyttigt svar

As I wrote, I now have zero extensions but I do have plugins. But as I see they are not disabled when I run in safe mode and in safe mode it works. Also, the video works if I go directly to youtube, but not if I view it embedded/in a iframe.

  • Top 10 Contributor
  • Moderator
10761 løsninger 96847 svar

Nyttigt svar

Try to disable hardware acceleration in Firefox.

You can check for problems caused by recent Flash updates and try these:

  • disable a possible RealPlayer Browser Record Plugin extension for Firefox and update the RealPlayer if installed
  • disable protected mode in Flash 11.3 and later
  • disable hardware acceleration in the Flash plugin
eyeLOVEmyDUCKS 0 løsninger 1 svar

So I unchecked the box: "Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available" and the embedded video starting playing VIDEO! Thanks for that. Now I'm curious if it should work however with it clicked though?