[Libva] display_order vs encode_order

[Shi Yan]

Hello there,

I'm trying to learn libva video encoding. Since the pdf document is
outdated, I have to learn the example encoder code.

I noticed two kinds of orders, one is called encode_order, the other is
called display_order. I can't understand the later one.

how come the display order be different than encode_order? if I encode a
video in the order of 0 1 2 3 4 5 ... Shouldn't we display them in the same
order?

Could you explain it to me? Thanks!
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