mpeg_encoder is no longer supported and ffmpeg/libavcodec provide equivalent (but much more extensive) capability.
I would like to see the mpeg_encode interface replaced by an ffmpeg call. Ultimately, it would be useful to have a
direct libavcodec interface so that lots of temp files are not needed to generate movies from PDL. See the ffmpeg
documentation at http://ffmpeg.org/documentation.html for more information.