This switches from the bundled ffmpeg library to the pkgsrc one,
although this is strongly discouraged -- the build process of the
bundled one os so f'ed up that I couldn't get it to build with
pkgsrc libtool with readonable effort.
The update is needed for some push/pull change in gstreamer which
is needed for the totem youtube plugin.
changes:
-Updated FFmpeg snapshot with many more formats
-Vastly improved playback
-Ported the muxer support from GStreamer 0.8
-Expose more encoder settings as element properties
-Post-processing elements ported
-QoS support for slow cpus
-Parallel installability with 0.8.x series
-Threadsafe design and API
-bugfixes
