Retrieving metadata from x264?

Hi, I am trying to exctract the meta data from x264-encoded video files. First priority is to map the IDR-frames structure. The work seams to be harder than expected and I am trying to find command line applications that I can control from my code. Mp4box has an option "-dump-xml" or similar but I can't figure out how it works. Not much help available on the net on this option. Anyone who can give me a hint on this or any other alternative? Thank you.

You might look into the code for mpeg4ip's h264_parse. (util/h264/main.cpp) If you just want to use another tool's output, h264_parse already gives you a ton of information (but only on raw .264 files).

Thanks for your answer. Do you know where I can find a compiled version of the program?