Original commit message from CVS:
* ext/Makefile.am: (SUBDIRS):
* ext/libpostproc:
* ext/libpostproc/Makefile.am:
* ext/libpostproc/gstpostproc.c:
* ext/libpostproc/gstpostproc.h:
ffmpeg's libpostproc wrapper plugins
* configure.ac:
added --enable-pp to ffmpeg configure arguments