/usr/lib/x86_64-linux-gnu/pkgconfig/libffmpegthumbnailer.pc is in libffmpegthumbnailer-dev 2.1.1-0.1+b3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: libffmpegthumbnailer
Description: Generates thumbnails for movie files
Version: 2.1.1
Libs: -L${libdir} -lffmpegthumbnailer
Libs.private: -L -lavcodec -lavutil -lavfilter -lavformat /usr/lib/x86_64-linux-gnu/libjpeg.so /usr/lib/x86_64-linux-gnu/libpng.so /usr/lib/x86_64-linux-gnu/libz.so
Cflags: -I${includedir}
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