Installation
libvpx
obtained the source code from git repo as:.
$ git clone git://review.webmproject.org/libvpx.git
$ git pull
and compile & Install as
$ ./configure
$ make install
Compile and Install ffmpeg and enable libvpx support.
for ffmpeg support follow Link
Now your system is ready with ffmpeg having support for webm.
I converted a flash video to webm container format and sharing some frames played with TOTEM