[Mp4-tech] Mpeg4- part2 video time issue

[Veni Soni]

Aisf,
Yes u r rt for voptime_increment. but for
modulo_time_base, it seems to be contradicting with
specs. According to you when modulo time base is going
to be reset.
veni
enJOY life
--- asif <asifali tataelxsi.co.in> wrote:
> Hello Veni...
> I'll tell u in detail...
> say vop_time_increment_resolution is 30000 ticks
> (30000 ticks/second -
> generic case )
> and  vop_time_inrement isincrementing by 1200
> ticks...
> so your modulo_time_base (16 bit) will get
> incremented by one after  each
> second of content is over..
> ie when vop_time_inrement reaches 30000.The
> vop_time_inrement will reset and
> start from 0 again...
> modulo_time_base can thus represent 2^16 seconds...
> 
> 
> rgds
> asif
> 
> 
> -----Original Message-----
> From: Veni Soni [mailto:vodprof yahoo.com]
> Sent: Monday, July 19, 2023 2:52 PM
> To: asifali tataelxsi.co.in; 'mp4list'
> Subject: RE: [Mp4-tech] Mpeg4- part2 video time
> issue
> 
> 
> Hi asif,
> 
> You incresed modulo_time_base for everyone. But it
> says modulo_time_base is respect to the previous
> time_code of gov or previous modulo_time_base of
> previous I. So after I that sould reset.
> 
> Regards
> veni
> 
> --- asif <asifali tataelxsi.co.in> wrote:
> > Hello Veni
> > it depends on your vop_time_increment_resolution
> > (VOL header)
> >
> > if it is 3 ticks(3 ticks/second)
> > frames                   I      P      P      I  
> P
> >  P   1 ...
> > molulo_time_base         0      0      0      1  
> 1
> >  1   2...
> > vop_time_increment       1      2      3      1  
> 2
> >  3   1...
> >
> > if it is 4 ticks(4 ticks/second)
> > frames                   I      P      P      I  
> P
> >  P   1 ...
> > molulo_time_base         0      0      0      0  
> 1
> >  1   1 ...
> > vop_time_increment       1      2      3      4  
> 1
> >  2   3 ...
> > ...
> > RGDS
> > 	Asif
> >
> >
> >
> > -----Original Message-----
> > From: mp4-tech-bounces lists.mpegif.org
> > [mailto:mp4-tech-bounces lists.mpegif.org]On
> Behalf
> > Of Veni Soni
> > Sent: Monday, July 19, 2023 12:27 PM
> > To: mp4list
> > Subject: [Mp4-tech] Mpeg4- part2 video time issue
> >
> >
> > Folks:
> >
> > There is a ambiguity regarding the
> > vop_time_increment.
> > Say as for example difference between each frame
> is
> > 1
> > tick of vop_time_increment_resolution. Then what
> > should be the value of vop_time_increment of last
> I
> > frame(shown below). Whether it should be 1 or 4.
> > Assume there is no GOV inbetween.
> >
> > frames                   I      P      P      I
> > molulo_time_base         0      0      0      0
> > vop_time_increment       1      2      3      1/4
> >
> > veni
> > enJOY life
> >
> >
> >
> >
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