[Mp4-tech] How to fiter out I/P/B frame from a encoded video stream?

[Amy, Mei-Hsuan Lu]

Hi everyone,
I am currently using Microsoft MPEG-4 Visual Reference Software to do some expriment. What i want to do is to "fiter out" I/P/B frame from the encoded video stream generated by the MS FGS encoder (so that I can play with different type of frame separately). I know I can locate the start of a I/B/P frame by using vop_start_code and vop_coding_type. But how can I know the frame length so that I know where is the end of frame?
Thanks
Amy Lu
amylu cmu.edu