[FFmpeg-devel] [PATCH] libavfilter: created a new filter that obtains the average peak signal-to-noise ratio (PSNR) of two input video files in YUV format.

[Roger Pau Monné]

Hello,

Sorry for the delay, I'm really busy these weeks, I will like to
implement the option to store the results in a qpsnr style, but right
now I don't have time, let's see if I can do it in a week or two. I've
applied the suggested changes, thanks Stefano.

Regards, Roger.

2011/6/10 Mark Himsley <mark at mdsh.com>:
> On 10/06/11 00:18, Stefano Sabatini wrote:
>>
>> On date Tuesday 2011-06-07 14:03:36 +0200, Roger Pau Monné encoded:
>
>>> +    switch (inlink->format) {
>>> +    case PIX_FMT_YUV410P:
>>> +    case PIX_FMT_YUV411P:
>>> +    case PIX_FMT_YUV420P:
>>> +    case PIX_FMT_YUV422P:
>>> +    case PIX_FMT_YUV440P:
>>> +    case PIX_FMT_YUV444P:
>>> +    case PIX_FMT_YUVA420P:
>>
>>> +        psnr->max[0] = 235;
>>
>> psnr->max[3] = 255;
>>
>> at least I suppose this is the max alpha value in
>> psnr->YUVA420P, yes I forgot this in the lut filter
>
> It is not. Alpha is always 0 - 255 (headroom is not required in an alpha
> signal, you can't have more than completely keyed on, or less than not keyed
> on at all)
>
>>> +        psnr->max[1] = psnr->max[2] = 240;
>>
>>
>>> +        break;
>>> +    default:
>>> +        psnr->max[0] = psnr->max[1] = psnr->max[2] = psnr->max[3] = 255;
>>> +    }
>>> +
>
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