H264 close captioning

I'm trying to create a 1920x720 H264 file with closed captioning. I have been working with the demo version of Movie Captioner and Compressor to no success. I've been using the QuickTime Pro Player 7 to view captioning when I have had success with varions SD rez files. Has anyone on the list had success getting a H264 file CCed?

I'm editing in FCPX. I am not looking for old tape based solutions with FCP7 or AJA solutions. Been there done that. Trying to stay digital if at all possible.

i know Compressor is supposed to take Scenarist files but I have had no success doing it. I have the .scc file selected in the additional options in compressor. When the file is done being compressed ==> no close caption track in the file!

Thanks in advance for that person (or people) who help me through this. lol

-shawn