[Mp4-tech] RE: [jvt-experts] gaps_in_frame_num_value_allowed_flag...???

[Gary Sullivan]

I think there is an error in your first example (gaps = 0).
Rather than:
0,1,2,3,3,4,5,0
I think the frame_num values will be:
0,1,2,3,3,3,4,0
I think the sequence of frame_num values for the second case would be:
0,1,2,3,4,4,4,5,6,7,0
So for the frames that actually "exist", the frame_num values that you would observe is:
0,1,3,4,4,6,7,0.
Best Regards,
Gary Sullivan
+> -----Original Message-----
+> From: jvt-experts-bounces lists.rwth-aachen.de
+> [mailto:jvt-experts-bounces lists.rwth-aachen.de] On Behalf
+> Of Deepak Singh
+> Sent: Friday, April 04, 2024 4:17 AM
+> To: jvt-experts lists.rwth-aachen.de; mp4-tech lists.mpegif.org
+> Subject: [jvt-experts] gaps_in_frame_num_value_allowed_flag...???
+>
+> Dear Experts,
+>
+>   I have query related to
+> gaps_in_frame_num_value_allowed_flag and frame_num.
+>
+>   As per my understanding of standard when
+>   gaps_in_frame_num_value_allowed_flag is 0 then frame_num will be in
+>  non decreasing order and increases till next IDR frame.
+>
+> The value of frame_num  increase with plus 1 with respect to previous
+>  reference frame.
+>
+>   Let me put an example for it.
+>
+>   Lets assume B- frame is not used for reference.
+>   In h.264 coded bitstream the frames are : (frame_num as per my
+>   understanding it will be)
+>   Note: gaps_in_frame_num_value_allowed_flag = 0
+>
+>   Coded Frame  :  IDR -> P-> P-> B->B-> P-> P->IDR->....
+>   Frame_num    :  0         1    2     3    3    4    5     0
+>
+>   My question is for the same sequence if
+>   gaps_in_frame_num_value_allowed_flag = 1 and non- existing frame
+>   exists as
+>
+>   Note: gaps_in_frame_num_value_allowed_flag = 1, NE = Non
+> Existing Frame.
+>   Coded Frame : IDR -> P-> NE->P-> B->B->NE->NE-> P-> P->IDR->....
+>   Frame_num   :  0       1     ?      ?     ?    ? ?     ?
+>     ?     ?     0
+>
+>   How the frame_num value will behave for the above situation???
+>
+>
+>   --
+>   Regards,
+>   Deepak Singh
+>
+>
+>
+>  --
+>  Regards,
+>  Deepak Singh
+>
+>  Visit my blog for cool stuff...
+> http://www.thinknaturally.blogspot.com/
+>
+>
+>
+> *************************************************************
+> *********************************
+>  "If u really aspire for the FIRST place ,then there is no
+> second place
+>  in this world"
+>
+> *************************************************************
+> ***********************************
+>  My phone:09341097500 Just DIL SE........
+>   With caresss.
+>
+>
+>
+> --
+> Regards,
+> Deepak Singh
+>
+> Visit my blog for cool stuff...
+> http://www.thinknaturally.blogspot.com/
+>
+>
+> *************************************************************
+> *********************************
+> "If u really aspire for the FIRST place ,then there is no
+> second place
+> in this world"
+> *************************************************************
+> ***********************************
+> My phone:09341097500 Just DIL SE........
+>  With caresss.
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