I compiled and installed the whole ffmpeg library successfully, including the ffplay application.
My system is running Ubuntu.
Now I want to do a little testing with the ffplay application. So I created a new directory "ffplay" in my home directory and put ffplay.c and all the needed includes there.
I also created a simple makefile including all the ffmpeg libraries and the SDL2 stuff.
It compiles without error b when I link it I get six unresolved symbols which should be in avfilter. They are all beginning with av_buffersink. If I look with nm into the libavfilter I can see the functions there. Any idea what I am doing wrong?