[Mp4-tech] reg initialisation process for reference picture lists for B slices in H264 decoder

[John Cox]

Hi
My guess:
It means that element 0 is different in the two lists which means that
bidirectional encoding (and in particular direct encoding) will normally
be between two different reference pictures and as I recall it is more
efficient (in terms of coded bits) to select between L0[0]/L1[0] than it
is to select between L0[0]/L0[1].
John Cox
>Dear experts,
>
> 
>
>I have one querry related to the Initialisation process for reference picture
>lists for B slices in frames\fields in H264 video decoder.
>
>In the section 8.2.4.2.3 for frames and 8.2.4.2.4 for fields in the standard,
>it has been written that when the RefPicList1 has more than one entry and
>refPicList1 is identical to the RefPicList0, the first two entries
>RefPicList1[0] and RefPicList1[1] are swapped.
>
> 
>
>My querry is what is the significance of swapping the first two entries of
>RefPicList1? I mean to say why this swapping of these two lists are required?
>
> 
>
>Could anyone help me to figure out this doubt? 
>
> 
>
>With best regards
>
>Ashwani
>
> 
>
> 
>
>
>
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