How to define I, P, B frames for GOP?

[Nologic]

I'm looking to find how I would represent the following two strings in FFMpeg:

IBBPBBPBBPBBPBBI...
IPPPPPPPPPPPPPPI...

While getting the answer would be awesome...I'd also like it explained how to figure this stuff out for myself...as I may very well need to do this again in the future and I don't like bugging others to fix my issue for me.

I'm guessing I'd be making use of:
-bf
-b_qfactor
-b_qoffset
-b_sensitivity
-b_strategy
-i_count
-i_qfactor
-i_qoffset
-i_tex_bits
-p_count
-p_mask
-p_tex_bits

I'm also guessing my GOP would be 16: -g 16

Anyways thanks ahead of time.

[jagabo]

I don't really use ffmpeg, but from reading some docs, I think:

-g 16 for 16 frame GOPs
-bf 0 for no b-frames (IPPPP...I)
-bf 2 for 2 consecutive b frames (IBBPBBPBBP....I)

[Nologic]

Many thanks