[Libav-user] Fast colourspace conversion on iOS

[Yurii Monakov]

Hi,

You can try libyuv library to convert colorspaces. It is really faster than
swscale from our tests.

Yurii

сб, 17 июля 2021 г. в 15:24, Nuno Santos <nuno.santos at imaginando.pt>:

> Nicolas,
>
> Thanks for your reply.
>
> The referred measures are based on:
>
> - Intel i5 2.4 Ghz quad core (desktop)
> - 2018 iPad Pro 12’9 (A12X processor)
>
> Regards,
>
> Nuno
>
> > On 17 Jul 2021, at 12:49, Nicolas George <george at nsup.org> wrote:
> >
> > Nuno Santos (12021-07-17):
> >> I’m using libav to mux a video file at full hd.
> >>
> >> At some point I need to convert the original frame at 1920x1080 RGB to
> YUV420P
> >>
> >> This requires sws_scale to be called. On desktop it takes around 7/8 ms
> to convert a frame. On iOS it takes 28 ms.
> >>
> >> I guess sws_scale is not optimised for iOS. How is people doing it on
> iOS then?
> >
> > I do not think that sws_scale requires OS-specific optimizations.
> >
> > What are the CPUs of your desktop and mobile devices?
> >
> > Regards,
> >
> > --
> >  Nicolas George
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