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H.264 Time stamp, SEI, VUI,

Hello All,

In MPEG-2 GOP header will give the information about time value in HH:MM:SS:FF; along with drop flag.

Like GOP i understand in H.264 there is VUI and SEI information about the time code.

In VUI i will able to decode timing_info_present_flag,num_units_in_tick,time_scale, fixed_frame_rate_flag etc ...

using this i can generate the time stamp for each frame from a fixed start time value.

The second option is SEI pic_timing () . In this i will get the direct timing information or the cpb_removal_delay.

I have the following question needs to verify.

Is there any other place i can see the time stamp information other than VUI and SEI ?

what is the use of SEI unregistered message ?

Will i can process SEI without VUI?

Please give some reference for the above questions

Thank you

Dave