[FFmpeg-devel] [PATCH 1/3] avutil/frame: add use_last_roi

[Hendrik Leppkes]

On Fri, Feb 14, 2020 at 4:41 AM Guo, Yejun <yejun.guo at intel.com> wrote:
>
> For some cases, the regions of interest do not change, it is not
> convenient to always prepare the roi data for every frame. So, add
> use_last_roi to show it uses the same roi data as last frame.
>
> Since a new flag is added into AVFrame, the major version number of
> lavu is changed.
>

Changing the major version for a field addition is not acceptable, it
should be added to the end and not require that. Furthermore, I feel
like the entire presence of that field in AVFrame is not a good idea.
Its a very specific field, and we actively tried to remove such fields
from the very generic structures like AVFrame, using side-data and
other feature/codec-specific things instead. ROI itself is side-data,
so this flag should be as well.

- Hendrik