Because today I try to modify it by adding some printf in it in a
fonction which I know she is called because I call it myself
(av_write_trailer for information) and after adding my printf I run the
following command :
cd <path_to_ffmpeg_root_source_code_folder> && sudo find . -name "*.d"
-delete && sudo find . -name "*.o" -delete && sudo make uninstall &&
sudo make && sudo make install
but my printf are not displayed so I think the version which is executed
is not the one with the printf.
So how to modify and after that compile libav with my modifications ?