This is a hacked-up MPEG importer for libannodex, which is based
on the code provided by "mpgtx", a command-line MPEG toolbox
<http://mpgtx.sourceforge.net/>.  It does the job, although you
have to hack the picture_rates struct in anx_import_mpeg.c if you
get odd synchronisation errors.

Be aware that unlike the rest of the core libraries, this code is
not BSD -- it's licensed under the GPL because we've used source
code provided by mpgtx.