[Mp4-tech] reference lists

[h M]

Hi all,
 As I know, each flag in the bitstream is present to reduce the needed
bitrate. Could you explain for me why shall the encoder fix the length of
the initialised list0 or list1 to be affected by the reordering (by the
num_ref_idx_lX_active_minus1 flag) ?
How does this reduce the needed bitrate ?
Thanks
Hichem
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