[Mp4-tech] Re: [Video] Regarding Loop Filter

[Vallabha Vasant Hampiholi]

Dear Karsten,
            Thanks for that info.
I did find a few test vectors(in the JVT site) in which the parameter
disable_deblocking_filter_idc was set to 1. That meant that the whole slice
wasn't applied loopfilter at all.
Are there any test vectors available which has loopfilter enabled and the
parameter disable_deblocking_filter_idc is set to 2, so that the loopfilter
isn't applied to the MB edges lying at the slice boundary.
Presently all the 35 baseline test vectors have disable_deblocking_filter_idc
set to either 0 or 1. 
-Thanks and Regards
Vallabha
-----Original Message-----
From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Karsten Suehring
Sent: Friday, October 26, 2023 7:17 PM
To: Gary Sullivan
Cc: Tourapis, Alexis; mp4-tech lists.mpegif.org; Leontaris, Athanasios
Subject: [Mp4-tech] Re: [Video] Regarding Loop Filter
Hi,
I don't know yet, if there is a problem in general, but at least in
CI1_FT_B.264 all syntax elements disable_deblocking_filter_idc have the
value of zero, which means deblocking across slice boundaries and
corresponds to the behavior you describe.
Best regards,
Karsten
> ------------------------------------------------------------------------
> *From:* mp4-tech-bounces lists.mpegif.org
> [mailto:mp4-tech-bounces lists.mpegif.org] *On Behalf Of *Vallabha
> Vasant Hampiholi
> *Sent:* Friday, October 26, 2023 4:28 AM
> *To:* mp4-tech lists.mpegif.org
> *Subject:* [Mp4-tech] [Video] Regarding Loop Filter
> 
> Hello,
> 
>  
> 
>             I noticed an interesting thing with the Loopfilter module.
> 
>  
> 
>             The parameter MbQ->LFDisableIdc is supposed to give the
> information if filter is to be applied at the Slice boundary or not.
> 
>            
> 
>             In test vector CI1_FT_B.264 the 1^st horizontal edge (dir
> =1, edge =0) of the macroblock number 22 (MB 23) lies at the slice edge.
> 
>             (Confirm this by opening the file in Elecard or any other
> H264 file viewer).
> 
>  
> 
>             But irrespective of this, the loopfilter is still applied to
> this edge.   
> 
>  
> 
>             And doing further investigation it is found that only the
> MB's lying at the 1^st row and 1^st column are not applied loopfilter at
> the 1^st edge in both directions and for the rest of the MB's the
> 
>             filtering is applied. Can I know what is the logic used here?
> 
>  
> 
> -Regards
> 
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