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

[Karsten Suehring]

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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