Paulos K <[email protected]> added the comment:

Your explanation put some more light on my debugging. Now it looks much better.
Difference between x4->enc->param params and x4->params I mentioned in my
previous note is at the moment when control is just entered the
x264_encoder_reconfig().

But now I understand that my question should rather be:
which fields of x4->enc->param are effectivelly changed by
x264_encoder_reconfig(). Thus I checked contents of x4->enc->param at the
beginning and then at the end of x264_encoder_reconfig().
Looks like there are 3 differences. All of them SEEM for me to be changed
legally and on purpose:
i_chroma_qp_offset (changed by x264_validate_parameters() from -2 to -4)
i_mv_range (changed again by x264_validate_parameters from 512 to 256)
b_tff - obvious.

As for me result looks consistent.

By the way,
unfortunatelly I encoded some movies with buggy ffmpeg and erased the source. Do
You know a way or have an idea on to fix my mp4 movies without need of 
reencoding.

best regards,
Paul

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