[FFmpeg-devel] [PATCH v9 2/4] avcodec/hevc_sei: add support for user data unregistered SEI message

[lance.lmwang at gmail.com]

On Wed, Mar 18, 2020 at 11:12:54AM -0300, James Almer wrote:
> On 3/17/2020 11:37 PM, Limin Wang wrote:
> > On Wed, Mar 18, 2020 at 12:13:33AM +0000, Derek Buitenhuis wrote:
> >> On 17/03/2020 23:11, Limin Wang wrote:
> >>> The user data unregistered allows arbitrary data to be carried in the bitstream,
> >>> for example, ROI info, time info etc. For the real support patch, please refer to
> >>> the pending patch series 7, 8 in below link:
> >>> https://patchwork.ffmpeg.org/project/ffmpeg/patch/20200107050355.17503-1-lance.lmwang@gmail.com/
> >>
> >> I understand what the SEI does. I was inquiring as to what the usecase you had
> >> in mind for it specifically. I don't like the idea of adding APIs that are only
> >> theorically useful - that is, what data is intended to be shoved in there?
> > 
> > In order to identify the source of time used in the live event, the encoder system can
> > insert a time mode-source code along with each embedded precision time stamp. 
> > Each time mode-source code will be inserted into the H.264/H.265 bitstream as an SEI
> > message of type User Data (Unregistered). The format is self-defined json string 
> 
> You may want to look at the Producer Reference Time side data, then.

Thanks, I'll check it. But we have more private user data which I didn't want
to make them public..

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-- 
Thanks,
Limin Wang