[x264-devel] Questions of Deterministic option

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Hello all,

I am currently observing a x264 encoding result and I have a question about non-deterministic option.

What I am wondering is which logic makes different result when we encode the same file with same option in a multi-core environment(in single core environment, we did not see any different results).

Through testing, we found a deterministic option in VLC, in particular for x264. However, since we don't have enough knowledge of encoding, It is hard to see all codes and find the logics behind this "deterministic option" effect.
 
Questions.1
What happens when we enable this deterministic option?
I tried to look at encoder/slicetype.c which looks at h->param.b_deterministic variable. But I don't understand about meaning of limit the number of frames.

Questions2.
How does logics change when we use deterministic options?

Questions3.
Is there any other logic that makes different result?

Thank you.

Regards, 
Giyoung Nam.