[Mp4-tech] mbaff

[mark_wezelenburg zonnet.nl]

Hi,
Check, It's the "mb_field_decoding_flag" that I missed (slice data)
Mark
Citeren Gary Sullivan <garysull windows.microsoft.com>:
>  
> Re: "it appears that mbaff is either active or inactive for an entire
> picture"
> 
> That statement is true.
> 
> There is nothing wrong with the statement in subclause 7.4.3.  The
> adaptivity of MBAFF is at the macroblock-pair level, not the slice
> level.
> 
> Best Regards,
> 
> Gary Sullivan
> 
> 
> +> -----Original Message-----
> +> From: mp4-tech-bounces lists.mpegif.org 
> +> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of 
> +> mark_wezelenburg zonnet.nl
> +> Sent: Tuesday, April 19, 2024 10:20 AM
> +> To: mp4-tech lists.mpegif.org
> +> Subject: [Mp4-tech] mbaff
> +> 
> +> Hi,
> +> 
> +> With reference to ITU H.264 05/2003
> +> 
> +> Section 6.2 claims the purpose of mbaff for local 
> +> frame/field encoding,
> +> however 7.4.3 states that the "field_pic_flag" must be the 
> +> same for all
> +> slice headers in a coded picture. since mbaff depends on 
> +> this parameter,
> +> it appears that mbaff is either active or inactive for an 
> +> entire picture.
> +> 
> +> I assume the text in 7.4.3 is wrong, is that so ? Or is 
> +> there another mechanism
> +> that I overlooked
> +> 
> +> Thanks,
> +> 
> +> Mark
> +> 
> +> 
> +> 
> +> 
> +> -- 
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