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[Mossroy <1323822@xxxxxxxxxxxxxxxxxx>]

I did not find any libav 9.14 package for Ubuntu (any version), so I finally compiled it myself on Trusty, from mainstream source.
After converting the source video with the same command-line, it outputs the attached webm file, which works correctly in Firefox.

In order to check that the issue did not come from the patches of Ubuntu
(or the compilation options I used), I also compiled version 9.13 from
source, and reproduced the issue in Firefox.

So version 9.14 of libav solves the issue.
It's certainly the same issue as in the libav bugtracker mentioned above : a bug in libav that makes it generate corrupt webm files.

Would it be possible to upgrade libav to 9.14 in Trusty?

** Attachment added: "WebM file generated on Trusty with libav 9.14"
   https://bugs.launchpad.net/ubuntu/+source/libav/+bug/1323822/+attachment/4149877/+files/P5270914-trusty-avconv-9.14.webm

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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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