Add an MPEG finder in the new format - functionality copied from VXL.

Modules/FindMPEG.cmake

+#
+# Find the native MPEG includes and library
+#
+# This module defines
+# MPEG_INCLUDE_DIR, where to find MPEG.h, etc.
+# MPEG_LIBRARIES, the libraries to link against to use MPEG.
+# MPEG_FOUND, If false, do not try to use MPEG.
+
+# also defined, but not for general use are
+# MPEG_mpeg2_LIBRARY, where to find the MPEG library.
+# MPEG_vo_LIBRARY, where to find the vo library.
+
+FIND_PATH(MPEG_INCLUDE_DIR mpeg2dec/include/video_out.h
+  /usr/local/include
+  /usr/include
+  /usr/local/livid
+)
+
+FIND_LIBRARY(MPEG_mpeg2_LIBRARY mpeg2
+  /usr/local/lib
+  /usr/lib
+  /usr/local/livid/mpeg2dec/libmpeg2/.libs
+)
+
+FIND_LIBRARY( MPEG_vo_LIBRARY vo
+  /usr/local/lib
+  /usr/lib
+  /usr/local/livid/mpeg2dec/libvo/.libs
+)
+
+SET( MPEG_FOUND "NO" )
+IF(MPEG_INCLUDE_DIR)
+  IF(MPEG_mpeg2_LIBRARY)
+    SET( MPEG_FOUND "YES" )
+    SET( MPEG_LIBRARIES ${MPEG_mpeg2_LIBRARY} ${MPEG_vo_LIBRARY} )
+  ENDIF(MPEG_mpeg2_LIBRARY)
+ENDIF(MPEG_INCLUDE_DIR)
+