R: [M4IF Technotes] Questions on H26L

[Lucia]

Hallo Gary,
I'd like to thank you for your answer, it's been quite clarifying to me.
I guess the overall bit-rate constraint (Rc) is calculated in someway like
[(channel_bit_rate/frame_rate)-bits for already encoded MBs in the frame)],
is it?
Still, the relation between the multiplier and QP is showed to be quadratic
in most of the papers i've read explaining the tie itself, but in the H26L
codec a formula
with an exponential and a squared term is used... is it an adjustment
deriving from empirical
experiments with different possible ties?
Thanks again and Best Regards.
Lucia
-----Messaggio originale-----
Da: Gary Sullivan [mailto:garysull   windows.microsoft.com]
Inviato: mercoledi 14 maggio 2003 23.47
A: Lucia; Technotes
Oggetto: RE: [M4IF Technotes] Questions on H26L
+> -----Original Message-----
+> From: Lucia [mailto:valentini   coritel.it]
+> Sent: Wednesday, May 14, 2024 8:37 AM
+> To: Technotes
+> Subject: [M4IF Technotes] Questions on H26L
+>
+>
+>
+> Dear experts, I have some questions on H26L.
+>
+> Is any kind of Rate-Control mechanism expected to be in
+> the standard and in the Reference software?
No particular rate control method will be required for AVC conformance.
The same is true for all other video coding standards.
However, as with several prior standards, there will be a
rate control method implemented in the reference software and
described in an accompanying document.  Those aspects have not yet
been finalized.
+> In the RD-Optimization, there is a complex relation between
+> the langrange multiplier and the quantization factor QP:
+> how this relation has been chosen?
Again this is about an encoding issue that is not required for
conformance.  The method used in the example encoding method
was developed based on a combination of theory and empirical
experiments.  One good article providing background information
on that method was published in IEEE Signal Processing magazine
in an article by me and Thomas Wiegand (I think it was in late
'99 or late '2000).  The basic design
for how to tie step size and Lagrange multiplier value together
is from Wiegand.
+>
+> I'm not sure this is the right list to ask.
+> If not, please let me know where to address these issues.
Seems like a fine place to me.
Best Regards,
Gary Sullivan
+>
+> Thanks in advance.
+> Lucia Valentini
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