[Mp4-tech] Re: Mp4-tech Digest, Vol 37, Issue 21

[pankaj bajpai]

Dear Aparna,
vop_time_increment always take the value between [0,vop_time_increment_resolution).
The number of bits taken by vop_time_increment is actually bits required to
represent above range.
Now, for variable rate(frame rate), what you should do is first set the fix_vop_rate
as 0. This represent that between two frames the time is not constant.
Now you can send the different time stamp (vop_time_increment).
with regards
> From: Aparna Sundar <sundar.aparna gmail.com>
> To: mp4-tech lists.mpegif.org
> Subject: [Mp4-tech] Meaning of Fields in the MPEG4 Visual bitstream
> Date: Tue, 29 Aug 2023 19:23:20 +0530
> 
> 
> Hi All,
> Iam trying to parse the MPEG4 Visual bitstream based on the bitstream syntax
> specified. Have some confusion with regard to the following fields in a VOP
> frame
> 1.VOP time increment: In the actual stream/recording, the rate may not match
> with the rate originally specified at the beginning
> (vop_time_increment_resolution). So there's this vop_time_increment field
> that mentions how many ticks have elapsed since the last synchronization
> (which I think corresponds to the intra period).
> 
> Unfortunately,iam unable to understand  what this means. How should I
> calculate the number of bits occupied by VOP time increment given
> VOP_timeincement resolution...
> Would appreciate any insights/solution to my problem.
> 
> Regards,
> Aparna Sundar
> 

Pankaj Kumar Bajpai
Mulitimedia Engineer
India
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