Does buffer data carries a sequence number while flowing through a pipeline?

[jeyp4]

Hello
v4l2src -> timeoverlay -> vaapih265enc -> vaapidecode -> appsink

Does data flowing through above(e.g.) pipeline carry any tag or any kind of
sequence number?

So that the final element(appsink) pad can match data tag with first element
pad(v4l2src).

My ultimate purpose is to provide a time-stamp to appsink data. Where the
time-stamp can represent to image shot time as close as possible. I am
flexible to use any time reference, e.g. ros::Time::now()



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