[Libav-user] Fast colourspace conversion on iOS

[Nuno Santos]

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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