That's true : Utopic now ships with libav-tools version 6:11~beta1-2, that is 
able to encode with VP9 codec inside a WebM container.
Great!

For those using Trusty, there are a few ways to encode with VP9 anyway (without 
upgrading to Utopic or running it inside a virtual machine) :
- compile libav 11 beta 1 under Trusty
- use Utopic libraries inside a Docker container
I explained these 2 options in 
http://blog.mossroy.fr/2014/09/03/encoder-des-videos-avec-le-codec-vp9-sur-ubuntu-trusty-en-utilisant-libav-et-docker/
 (in French) , with some generated videos and comparisons with VP8
- it's certainly also possible to upgrade libav with a PPA, but I did not want 
to "pollute" my OS (some programs that depend on libav might be broken)

Thanks for the upgrade in Utopic

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to libav in Ubuntu.
https://bugs.launchpad.net/bugs/1296378

Title:
  Activate VP9 codec in libav

Status in “libav” package in Ubuntu:
  Fix Released

Bug description:
  "avconv -encoders | grep vp" gives only :
  V... libvpx               libvpx VP8 (codec vp8)

  It does not give the encoder libvpx-vp9, which seems to be necessary to 
encode with VP9.
  Or maybe I missed something?

  Based on 
http://git.libav.org/?p=libav.git;a=commit;h=9aa053ceded5550b2e538578af383fd89d82364c
 , VP9 is available in libvpx since version 1.3.0 , which is the version libav 
is built with : http://packages.ubuntu.com/trusty/libvpx1
  VP9 is also mentioned in the changelog of the libvpx1 package : 
http://changelogs.ubuntu.com/changelogs/pool/main/libv/libvpx/libvpx_1.3.0-2/changelog

  
  Same issue when trying to read a file with VP9 codec. I tried with 
http://base-n.de/webm/out9.webm
  "avplay out9.webm" gives :
  [matroska,webm @ 0x7f1a80005be0] Unknown/unsupported AVCodecID V_VP9

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