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

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