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

Guo, Yejun yejun.guo at intel.com
Tue Feb 18 04:33:12 EET 2020

> -----Original Message-----
> From: ffmpeg-devel [mailto:ffmpeg-devel-bounces at ffmpeg.org] On Behalf Of
> James Almer
> Sent: Friday, February 14, 2020 9:33 PM
> To: ffmpeg-devel at ffmpeg.org
> Subject: Re: [FFmpeg-devel] [PATCH 1/3] avutil/frame: add use_last_roi
> On 2/14/2020 5:33 AM, Hendrik Leppkes wrote:
> > 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.
> This new field is also not acceptable because, same as the disposable
> flag i wanted to add some time ago, it is not really an attribute of a
> frame in itself, but of a frame in a frame chain.

thanks Hendrik and James. Understand the requirement for AVFrame now,
will first try to resolve it with another method at application level. thanks.

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