[Bug 1451404] Re: mp4 video shows a black box, and audio only

[Sergio Callegari]

Just to clarify...

I do not know if firefox is expected to be able to play mp4 or not.
What is not nice is that it pretends to play, only to deliver a black
box.  If mp4 is not supported, a box saying so should be used instead.

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Title:
  mp4 video shows a black box, and audio only

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