[Mp4-tech] Slice mapping in h.264

[Anil M S]

Dear Sir,
First of all, Sorry for the inconvenience caused.
Whatever you have understood is correct. At the decoder when I checked
the slice_group_id[i] entries it remains same as the first frame
entries, for the other frames also, and I think this is where it is
going wrong. I want to know whether this (slice_group_id entries )
info is sent for each frames ?and if it is sent, pls explain me in
detail about this Sir .
I am using JM86 ref code.
Baseline profile.
slice_group_map_type=6.
num_slice_groups_minus1=2.
Thanking you,  
Regards,
Anil 
On Wed, 2 Feb 2024 11:17:50 -0800, Gary Sullivan
<garysull windows.microsoft.com> wrote:
> 
> Anil,
> 
> It would help if you adhered more closely to the language of the
> standard so that it is easier to understand what you are saying.  (There
> is nothing in the standard called "slice number" or "slice mapping" in
> the standard.)
> 
> I think you are saying that you used slice_group_map_type equal to 6,
> and changed the value of some of the slice_group_id[i] entries from
> picture to picture.  Yes, that is permitted (if you are using the
> Baseline or Extended profile and all slice_group_id[i] values are in the
> range of 0 to num_slice_groups_minus1 and num_slice_groups_minus1 is in
> the range of 0 to 7).
> 
> You say that the bitstream that you generated caused the decoding
> process to fail in some way (although you don't seem to describe exact
> symptoms -- did the decoder put out an error message?  Exactly what
> happened?).
> 
> If I understand you correctly, I think there must be some problem in the
> software that you are using (although it isn't completely clear to me
> whether that problem is in the encoder or the decoder).
> 
> Best Regards,
> 
> Gary Sullivan
> 
> +> -----Original Message-----
> +> From: mp4-tech-bounces lists.mpegif.org
> +> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Anil M S
> +> Sent: Tuesday, February 01, 2024 9:38 PM
> +> To: mp4-tech lists.mpegif.org
> +> Subject: [Mp4-tech] Slice mapping in h.264
> +>
> +> hi,
> +> I am working on H.264(JM86).I need to change the slice mapping for
> +> each frame,i.e I have to dynamically change the slice number of each
> +> macroblock which is different than the first frame or prev frame.
> +> Is that permitted?Can we have different slice mappings for different
> +> frames.When I did this by using "pps"(Explicit mode(6)),I
> +> was not able
> +> to decode the encoded stream correctly.So pls suggest me the correct
> +> direction.
> +> Thanking You,
> +> Anil
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