Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

Cannot play mp4 files

  • 5 uphendule
  • 2 zinale nkinga
  • 20 views
  • Igcine ukuphendulwa ngu FredMcD

more options

On Windows Vista, firefox 38.0.5 cannot play mp4 files. Both MPC-HC and Windows Media Player can play mp4 files. I have ffdshow installed.

These are enabled:

   media.windows-media-foundation.enabled
   media.directshow.enabled

Results from https://www.youtube.com/html5 show:

Disabled: H.264, MSE & H.264, MSE & WebM VP9

Enabled: HTMLVideoElement, Media Source Extensions, WebM VP8

Youtube videos are also locked at 360p using the html5 player.

OGG / WebM files play fine.

On Windows Vista, firefox 38.0.5 cannot play mp4 files. Both MPC-HC and Windows Media Player can play mp4 files. I have ffdshow installed. These are enabled: media.windows-media-foundation.enabled media.directshow.enabled Results from https://www.youtube.com/html5 show: Disabled: H.264, MSE & H.264, MSE & WebM VP9 Enabled: HTMLVideoElement, Media Source Extensions, WebM VP8 Youtube videos are also locked at 360p using the html5 player. OGG / WebM files play fine.

Okulungisiwe ngu chuck1899

All Replies (5)

more options

Can anyone help?

more options

You can check these media prefs on the about:config page:

  • media.windows-media-foundation.enabled
  • media.directshow.enabled
more options

They are both enabled.

Refresh Firefox - reset add-ons and settings Refreshing Firefox didn't seem to do anything either.

Okulungisiwe ngu chuck1899

more options

It's been a month and even with Firefox 40.0.3 it still doesn't work.

Why?

more options

Sometimes, messages get lost from inactivity. Sorry.

check this:

  • see if there are updates for your graphics drive drivers

https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

  • disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)

https://forums.adobe.com/message/4468493#TemporaryWorkaround

  • disable hardware acceleration in the Flash plugin

https://forums.adobe.com/thread/891337 See also: