[Libav-user] Fast colourspace conversion on iOS

Nuno Santos nuno.santos at imaginando.pt
Sat Jul 17 15:24:06 EEST 2021


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
> _______________________________________________
> Libav-user mailing list
> Libav-user at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/libav-user
> 
> To unsubscribe, visit link above, or email
> libav-user-request at ffmpeg.org with subject "unsubscribe".



More information about the Libav-user mailing list