Yes. I think what he was asking is are you sure you want to add this to the 
AVPacket which is encoded data and will be ordered in decode time not 
presentation time. The precision time stamp is a separate clock but should be 
more closely related to the presentation time stamp (assumming its there). It 
looks like there are several merge requests for adding side data to the AVFrame 
https://patchwork.ffmpeg.org/project/ffmpeg/patch/1591793766-15844-1-git-send-email-lance.lmw...@gmail.com/
 I am not sure if this is related or conincidental

Dan
________________________________________
From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> on behalf of Brad Hards 
<br...@frogmouth.net>
Sent: Wednesday, June 10, 2020 3:06 PM
To: 'FFmpeg development discussions and patches'
Subject: Re: [FFmpeg-devel] [PATCH] added sei side data

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The side data that is added is a precision time stamp (MISB ST0603), which may 
or may not relate to the presentation time stamp.

Unfortunate overlap of acronym.

Brad

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