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"Media resource FILEPATH / FILENAME.mp4 cannot be decrypted." when trying to play h264 encoded files on Firefox 35

We use mp4 files using the h264 codec on our server to play videos. Files in FF before FF35 worked fine, they work in IE8 + and Chrome. In FF35 we get the following message in the console

Media resource FILEPATH/FILENAME.mp4 could not be decoded.

If we then load the resource, we get

 Video can't be played because the file is corrupt.

Is there something we need to do for mp4 files to make them work in FF35? This behavior has been replicated to FF35 on OS 10.6.8-10.9, Windows 7, and Windows 8.

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firefox html5-video video-streaming
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Comment on this error:

Error 1130450 - Some MP4 videos cannot be played because they cannot be decoded. https://bugzilla.mozilla.org/show_bug.cgi?id=1130450

They need steps to play, as well as sample video and video information, User Agent ...

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I tried several Firefox Addons to fix this, but it didn’t work (in my case it happened with MOV files).

But here's what worked in the end:

  • Go to Firefox about:config (from the address bar).

  • Find mp4

  • He should list the following entries:

media.mediasource.mp4.enabled

media.mp4.enabled

  1. Double-click each entry and change it to false
  2. Restart Firefox and try playing the MP4 / MOV file again.
  3. Now he needs to offer to choose a Windows program to play - select your favorite player (my VLC ) and check it as the default.

Additional information about this issue:

https://support.mozilla.org/en-US/questions/1115863

https://support.mozilla.org/en-US/questions/1019812

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