FW: [Mp4-tech] Slice mapping in h.264

[Rob Koenen (MPEGIF)]

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-----Original Message-----
From: Karsten Suehring [mailto:Karsten.Suehring hhi.fraunhofer.de] 
Sent: Thursday, 03 February, 2005 10:54
To: Anil M S
Cc: Gary Sullivan; mp4-tech lists.mpegif.org; jvt-experts mail.imtc.org;
Alexis Michael Tourapis
Subject: Re: [Mp4-tech] Slice mapping in h.264
Dear Anil,
slice_group_id[i] syntax elements are contained in the picture parameter 
set. The used picture parameter set (PPS) can be change for each 
pitucre, the reference software typically uses one PPS for the whole stream.
When you set slice_group_map_type = 6 in the config file you need to 
provide a file in SliceGroupConfigFileName that contains a list of all 
slice_group_id valued (one value per line, see sg6conf.cfg as an example)
Best regards,
Karsten
Anil M S wrote:
> 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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>>
>