build h264 nav SPS

[cxl7980]

i want extract mkv h264 video, but don' know how to write the nav Sequence parameter set information. i watch the MKVextractGUI_154.exe extract video the NAV sps profile_idc=100, but ISO/IEC14496-10 special is 66,77,88. i can read the data "coded slice of a non-IDR picture" from mkv, how can i build a SPS for it?

thanks