Record activity performance

[Benjamin M. Schwartz]

Just so everyone knows, there have recently been major speedups in the
Theora encoder (libtheora), which is a bottleneck for Record performance.
 These speedups are available in version 1.2-alpha1, which (despite the
name) is the recommended version for all but the most conservative
applications.  It has zero known bugs and is ABI-compatible with all
preceding versions.

http://downloads.xiph.org/releases/theora/libtheora-1.2.0alpha1.tar.gz

I don't know how to get new versions of things into OLPC builds, but if
people are interested in Record performance this is probably worthwhile.
Version 1.2alpha1 at speed-level 2 should be faster and better than what
is currently in use.

--Ben

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