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[Mossroy <1323822@xxxxxxxxxxxxxxxxxx>]

I found 2 bug reports on upstream libav that seem to be related :
https://bugzilla.libav.org/show_bug.cgi?id=597
https://bugzilla.libav.org/show_bug.cgi?id=341
At least the symptom seems to be the same.
Both are fixed in Libav 9.14, by commit https://github.com/libav/libav/commit/9455a023be9f3915ccf5511a0b8fdb5b8897b2b6 
This has been commited between versions 9.13 (the one currently packaged for Trusty) and 9.14

So it would be worth trying with libav 9.14.
Unfortunately, this version does not seem to be compiled for Trusty in https://launchpad.net/~motumedia/+archive/ubuntu/libav-daily
Do you know an easy way to make this test? (I mean, without compiling it manually)

** Bug watch added: bugzilla.libav.org #597
   http://bugzilla.libav.org/show_bug.cgi?id=597

** Bug watch added: bugzilla.libav.org #341
   http://bugzilla.libav.org/show_bug.cgi?id=341

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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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