[FFmpeg-devel] [PATCH 0/6] Implement SEI parsing for QSV decoders

[Kieran Kunhya]

>
> Captions aren’t exactly “frame accurate” anyway as each frame has just a
> very small piece
>
> of information and only when a certain sequence is complete, it leads to
> some new letters
>
> or line being ready for display.
>

In many use-cases, you want them to be frame-accurate. Final rendition to
the viewer is only one use-case of FFmpeg (to be fair, the likely use-case
of QSV)
And you don't want errors accumulating across encode cycles.


> Do you have an idea where/how I could find such stream?
>

You would need to record them off various television services as they use a
wide range of encoder manufacturers.
Ideally, you could also inject them into various encoders and force them to
build complex reordering patterns and check they are frame accurate.

Regards,
Kieran

>