[Mp4-tech] [Video] AVC deblocking filter

[Gary Sullivan]

One possible reason to disable the deblocking filter is to make the
macroblocks more independent of each other for error-tracking and
error-recovery purposes.  Another might be to reduce the complexity of
the procesing in an encoder (so that the encoder does not need to
perform the deblocking filter when it is tracking what the decoder will
be using as reference pictures).
Best Regards,
Gary Sullivan
+> -----Original Message-----
+> From: mp4-tech-bounces lists.mpegif.org 
+> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Alan Thomson
+> Sent: Tuesday, July 27, 2023 8:25 AM
+> To: Mp4-Tech (E-mail)
+> Subject: [Mp4-tech] [Video] AVC deblocking filter
+> 
+> Hi all -
+> 
+> If I understand correctly, setting disable_deblocking_filter_idc to 1
+> completely turns off the in-loop filter. (14496-10:2003 para 8.7)
+> Given that the filter effectively turns itself off for small 
+> quantiser
+> values, and that images are likely to be blocky for larger 
+> quantiser values,
+> my question is:
+> under what circumstances would you _want_ to disable the filter? 
+> I'm not sure of the usefulness of this provision - am I 
+> missing something?
+> 
+> OK, 2 questions.
+> 
+> Thanks,
+> Alan
+> 
+> Alan W Thomson
+> Senior Software Engineer
+> IndigoVision Limited
+> The Edinburgh Technopole
+> Bush Loan, Edinburgh
+> Scotland, UK
+> EH26 0PJ
+> +44 (0)131 475 7215
+> +44 (0)131 475 7201 (Fax)
+> http://www.indigovision.com
+> 
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