Error was cased by undefined UINT64_C in stdint.h for c++
programs. As I understand from ffmpeg mailing list the simpliest
solution is to define __STDC_CONSTANT_MACROS before including
ffmpeg libraries. There already was some amout of such definitions in
the code and I've tested this with newer and older ffmpeg
libraries -- this should work and should be safe, but maybe
there is better way of fixing this problem.
