[FFmpeg-devel] [PATCH] libswscale/swscale_unscaled.c: UHD Resolution Performance Increase for Color Space Convertions / NVENC Related

[Ali KIZIL]

2016-10-03 14:39 GMT+03:00 Carl Eugen Hoyos <ceffmpeg at gmail.com>:

> 2016-10-03 13:11 GMT+02:00 Ali KIZIL <alikizil at gmail.com>:
> > 2016-10-03 14:09 GMT+03:00 Carl Eugen Hoyos <ceffmpeg at gmail.com>:
> >
> >> 2016-10-03 12:48 GMT+02:00 Ali KIZIL <alikizil at gmail.com>:
> >>
> >> > Yes, Alpha channel is not managed.
> >> >
> >> > So it should be;
> >> >
> >> >> +    /* yuv422p10_to_yuv420p */
> >> >> +    if ((srcFormat == AV_PIX_FMT_YUV422P10) &&
> >> >> +        (dstFormat == AV_PIX_FMT_YUV420P))
> >> >> +        c->swscale = yuv422p10ToYuv420pWrapper;
> >>
> >> (Apart from "too many parenthesis")
> >> I would prefer if alpha gets handled.
>
> > Got it. I dont have any source with alpha.
>
> This is about conversion of frames without alpha into
> frames with an alpha channel, so I don't think you need
> any source with alpha.
> Just set the opacity to 0xFF.
>
> I suspect you should pay attention to the dithering for
> the moment though.
>
> Carl Eugen
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Hello Carl,

OK, Well noted the info about 0xFF.
I will do it.

You and Hendrik are right. I googled around and understood what you mean by
dithering.
This will happen for function 10bit to 8bit
convertion yuv422p10ToYuv420pWrapper.
Rest 2 functions are 10bit to 10bit and 8 bit to 10bit, so they do not have
dithering problem.

I need to check how to do interpolation. Any example will be helpful.

Kind Regards,