[FFmpeg-devel] [PATCH v2 2/2] avcodec/h265_metadata_bsf: add option to insert a string as SEI unregistered user data

[Limin Wang]

On Mon, Jan 06, 2020 at 09:51:34PM +0000, Mark Thompson wrote:
> On 28/12/2019 01:38, Limin Wang wrote:
> > On Fri, Dec 27, 2019 at 11:32:40PM +0000, Mark Thompson wrote:
> >> On 26/12/2019 01:01, lance.lmwang at gmail.com wrote:
> >>> From: Limin Wang <lance.lmwang at gmail.com>
> >>>
> >>> Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> >>> ---
> >>> update to add keyframe NAL checking as H.264 patch for global header
> >>
> >> This case is much easier in H.265, though - the extradata can include SEI which applies globally, so just put it there rather than splicing it into the stream.
> > 
> > Mark, are you say put the user data into the extradata? For my case, the string
> > in the user data will be updated for every key frame runtime. 
> 
> Yes - if you put it in the extradata then it isn't necessary to update any frames in the stream at all.  That ends up being far simpler for global-header streams (MP4 / MKV), and in flat streams (Annex B, TS) the extradata will be spliced in at every seek point by the writer.

Sorry, my description isn't clear before, for my case, The user data may have time
related string, so it'll updated for every insertion.
Also, it'll be used for real time streaming, RTMP protocol etc. You had to use
API to get the function, FFmpeg cli can't test it.


> 
> - Mark
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-- 
Thanks,
Limin Wang