mxf_write_generic_desc  780 libavformat/mxfenc.c     mxf_write_generic_desc(s, st, key, size+8+8+8+8+8+8+5+16+sc->interlaced*4+12+20);
mxf_write_generic_desc  864 libavformat/mxfenc.c     mxf_write_generic_desc(s, st, key, size+5+12+8+8);