h.264 and mpeg header

Question

I'm trying to develop code for mpeg/h.264/RTP streaming. I'm quite new to all this , so maybe my question is a bit silly. I'm capturing video from the mobile camera (android) and I want to stream it. Looking in the net I've found many similar things, what I think I'm supposed to do is take out the mpeg4 header from the stream, this is , take of the first 40 bytes of the stream and after that I should find de NAL unit length in the next 4 bytes, but I'm not finding it, and I don't know why.

My stream looks like that :

mpeg4 header

0000001866747970336770340000030033677034336770360000000877696465000000006d646174

and then

3c911716be6679e1e001e7aff0000000800000000000000000000000000000003c4877.......

So my NAL unit length is 3c911716...which obviously is not my NALu length

Is there anything I'm missing ???

Thank you very much !