[Mp4-tech] Re: [video][H.264] Regarding disable_deblocking_filter_idc

[Gary Sullivan]

Bill et al,
The amount of smoothing introduced by the deblocking filter design is
highly adaptive to both the quantization fidelity (i.e., the
quantization step size) and the amount of blockiness found in the
pictures.  Yes, it will gradually "turn itself off" as fidelity
improves.  There is also a very high degree of flexibility supported in
the syntax to allow the encoder, at its discretion, to adjust the
strength of the deblocking filter or turn it off at slice edges or turn
it off completely.
Best Regards,
Gary Sullivan
________________________________
	From: Mandel, Bill (NBC Universal)
[mailto:bill.mandel nbcuni.com] 
	Sent: Friday, April 08, 2024 3:28 PM
	To: Gary Sullivan; Shen_sha(??); smithajo gmail.com;
7bca48b40504060302300a2f8e mail.gmail.com
	Cc: mp4-tech lists.mpegif.org
	Subject: RE: [Mp4-tech] Re: [video][H.264] Regarding
disable_deblocking_filter_idc
	I'd be interested in seeing or hearing about results of this
also. My guess would be that for HD content at some point at or above
8-12 Mbps with H.264+FREX turning off deblocking would be an
improvement. Would not the deblocking process just gradually extinguish
itself to not applicable? Analogous to how audio bass emphasis is
decreased on a stereo with the "loudness" button pressed but as you
increase the volume past 30-50%?
	You can sort of see this indirectly between 4 Mbps (which must
likely require deblocking) content:
	http://www.divxnetworks.com/solutions/hd/content.php
	and 8 Mbps content (which might still have deblocking, but it
might be throttled back?) here:
http://www.microsoft.com/windows/windowsmedia/content_provider/film/cont
entshowcase.aspx
http://download.microsoft.com/download/4/3/d/43dc9661-f69b-4735-9797-b3c
98199085e/MeetTheFockers_720p.exe
________________________________
	From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Gary Sullivan
	Sent: Friday, April 08, 2024 10:26 AM
	To: Shen_sha(??); smithajo gmail.com;
7bca48b40504060302300a2f8e mail.gmail.com
	Cc: mp4-tech lists.mpegif.org
	Subject: RE: [Mp4-tech] Re: [video][H.264] Regarding
disable_deblocking_filter_idc
	Have you done any experiments with turning the deblocking filter
off and on for video content that you think will be typical for this
application at bit rates that you think will be typical?  My impression
is that the deblocking filter is more useful than some people expect it
to be.
	-Gary
________________________________
		From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Shen_sha(??)
		Sent: Wednesday, April 06, 2024 11:03 PM
		To: smithajo gmail.com;
7bca48b40504060302300a2f8e mail.gmail.com
		Cc: mp4-tech lists.mpegif.org
		Subject: [Mp4-tech] Re: [video][H.264]
Regardingdisable_deblocking_filter_idc
		The deblocking filter is to improve the picture quality 
		and it's useful for low bit rate application. I think
		in the application of HDTV/DVD, this feature is not
needed
		because the picure quality is so good that no
improvement
		is needed. 
		Shen Sha
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