[Mp4-tech] NAL unit type 12

[kaustubh.patankar vsnl.net]

Dear Gary,
I will explain the situation. In case of CBR if the picture complexity
is not sufficient then the no of bits generated are less than the allcated 
bits in GOP. In this case we can have bit stuffing for the remaining bits.
This information can be put in NAL as
1. data NAL = Contains bit sttream data + zeros corroesponding to excess bits for GOP followed by training NAL bits
or
2. data NAL followed by separate NAL type 12 (Filler data NAL) corroesponding to excess bits for the GOP.
with reagrds
Kaustubh 
----- Original Message -----
From: Gary Sullivan <garysull windows.microsoft.com>
Date: Saturday, September 10, 2023 3:54 am
Subject: RE: [Mp4-tech] NAL unit type 12
> Kaustubh et al,
> 
> I don't understant what you mean by "stuffing byte".  Can you clarify?
> 
> e.g., are you talking about cabac_zero_word or leading_zero_8bits or
> trailing_zero_8bits or something else?
> 
> Best Regards,
> 
> Gary Sullivan
> 
> +> -----Original Message-----
> +> From: mp4-tech-bounces lists.mpegif.org 
> +> [mp4-tech-bounces lists.mpegif.org] On Behalf Of 
> +> kaustubh.patankar vsnl.net
> +> Sent: Thursday, September 08, 2023 4:54 AM
> +> To: mp4-tech lists.mpegif.org
> +> Subject: [Mp4-tech] NAL unit type 12
> +> 
> +> Dear All
> +> 
> +> Will any one explain the practical use of NAL unit type 12 case?
> +> The syntax defines it to be filler data. 
> +> 
> +> The case of filler unit can be in stuffing byte for under 
> +> utilization 
> +> of bit rate. Few encoders are implementing these bytes (filling 
> with 
> +> zero) as trailing zeros?.
> +> 
> +> Or can we put these zeros by making the NAL unit type as 12.
> +> 
> +> Please suggest.
> +> 
> +> with regards
> +> 
> +> Kaustubh
> +> 
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