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[Mossroy <1323822@xxxxxxxxxxxxxxxxxx>]

@erlenmayr:
I don't know the WebM/Ogg/VP8 specifications enough to say if the file is "corrupt" or not.
You might be right. And it's true that VLC is more permissive than many other players.
But the file also does play correctly with Totem and Chromium. So which software is buggy did not seem that obvious to me, unless we can say if this file complies to its specs or not.
That's why I opened the bug for both Firefox and avconv.

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https://bugs.launchpad.net/bugs/1323822

Title:
  Firefox can not play some WebM videos generated by avconv on Trusty

Status in The Mozilla Firefox Browser:
  Confirmed
Status in “firefox” package in Ubuntu:
  Confirmed
Status in “libav” package in Ubuntu:
  Confirmed

Bug description:
  Steps to reproduce :
  - Download the source H.264 video attached to this bug
  - On a Trusty machine, convert this video to WebM with "avconv -i P5270914.MOV P5270914-trusty.webm". It should give the same result as attached
  - Open this webm file in Totem or in VLC : it plays correctly
  - Open this webm file in Firefox 29. When you click on play, it goes directly to the end and does not show anything
  - Open this same webm file in Chromium (tested with version 34) : it plays correctly

  If you generate the WebM file on Precise, with the same command-line, it plays correctly in Firefox (see attached P5270914-precise.webm).
  So I suppose it comes from a difference in the way avconv does the conversion, that is not correctly supported by Firefox

  All tests are made with Precise and Trusty amd64, with all current updates.
  Firefox version 29.0 on both
  avconv 9.13-0ubuntu0.14.04.1 on Trusty, and 0.8.10-0ubuntu0.12.04.1 on Precise

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