Gorge,
About crashing:

That's odd, it's a tweaked version
Not the main.cpp program but the F_atempo plugin inside of Cinelerra.  Andrea is much more expert at testing the
ffmpeg plugins and it did not crash for him as stated in his email.  I did get the plugin to not crash but I do not know
what it is doing. 

When it runs , a terminal comes up to show you the technical info.  But the outfile is created.
I am still trying to compile the program because I have to put the     include <libavcodec/avcodec.h>  in the right place.
Then I will test it.  ...Phyllis