[Mp4-tech] [H.264] about causal contraint of HDR

[changhsu yahoo.com]

I had a few questions about HDR after studying a few
papers. Hope someone will help me out.
My understanding is that causal constraint is used by
the encoder to mimic(trace) buffer arrival timing of
the decoder. (via pre_dec_removal_delay)
Is this atatement correct?
Why do we need it in h264? What good it can do for us?
What is the  drawback of a non-causal HDR? larger
delay, larger buffer or anything else?
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