first commit

ffmpeg/lib/pkgconfig/libavformat.pc

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+prefix=./output
+exec_prefix=${prefix}
+libdir=./output/lib
+includedir=./output/include
+
+Name: libavformat
+Description: FFmpeg container format library
+Version: 58.45.100
+Requires: 
+Requires.private: libavcodec >= 58.91.100, libswresample >= 3.7.100, libavutil >= 56.51.100
+Conflicts:
+Libs: -L${libdir}  -lavformat 
+Libs.private: -lm
+Cflags: -I${includedir}