[Mp4-tech] Mpeg4- part2 video time issue

[Herbert Thoma]

Veni Soni schrieb:
> 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.

No. You don't reset after I VOP but after GOV header and
GOV header should only occur at full second time position.
  Herbert.
> 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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> 
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> 
>>
> 
> 
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-- 
Herbert Thoma
Group Manager Video
Multimedia Realtime Systems Department
Fraunhofer IIS
Am Wolfsmantel 33, 91058 Erlangen, Germany
Phone: +49-9131-776-323
Fax:   +49-9131-776-399
email: tma iis.fhg.de
www: http://www.iis.fhg.de/