libtheora in Ubuntu is outdated and upstream developers recommends upgrading to alpha5 to everyone

From http://theora.org :

[ 2005 August 20 - libtheora 1.0 alpha 5 release ]

We're pleased to announce a new release of the libtheora reference
implemenation. [..]

There are two important bugfixes as well, so we recommend upgrading to everyone.
This release is source and binary compatible with 1.0 alpha 4.

Changes since the 1.0 alpha 4 release:

    * Fixed bitrate management bugs that caused popping and encode errors.
    * Fixed a crash problem with the theora_state internals not being intialized
properly.
    * new theora_granule_shift() utility function
    * dump_video example now makes YUV4MPEG files by default, so the results can
be fed back to encoder_example and similar tools. The old behavior is restored
with the '-r' switch.
    * ./configure now prints a summary
    * simple unit test of the comment api under 'make check'
    * misc code cleanup, warning and leak fixes

http://theora.org: http://theora.org