eu tenho o mesmo problema. Se você estiver usando o Ubuntu > 14.04, tente isto:
sudo apt-cache policy libvpx1
libvpx1:
Installed: 1.3.0+git20150219-1~gd~t
Candidate: 1.3.0+git20150219-1~gd~t
Version table:
*** 1.3.0+git20150219-1~gd~t 0
100 /var/lib/dpkg/status
1.3.0-3~trusty 0
500 http://ppa.launchpad.net/mc3man/trusty-media/ubuntu/ trusty/main amd64 Packages
1.3.0-2 0
500 http://ru.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
E faça o downgrade desse pacote:
sudo apt-get install libvpx1=1.3.0-3~trusty