[x264-devel] Re: [PATCH] PSNR averages

[Laurent Aimar]

On Sun, Aug 08, 2004, Måns Rullgård wrote:
> Loren Merritt <lorenm at u.washington.edu> writes:
> 
> > x264 takes the arithmetic mean of frame-wise PSNRs to produce an
> > overall PSNR. This is meaningless. (Extreme case: what do you do with a
> > frame with no error? (infinite PSNR))
> > This patch corrects it to calculate PSNR from the mean squared error.
> >
> > I also replace "PSNR/Size" (which is similarly meaningless) with
> > "MSE*Size". This quantity is probably closer to what someone wants to
> > measure when they think of "PSNR/Size". It also tends to be relatively
> > constant for a given video over a wide range of QPs.)
> 
> Speaking of PSNRs, how much is the overhead of calculating these?  If
> I only want encoding speed, can anything be gained by disabling some
> calculations?
 In encoder/encoder.c, I added a #define DEBUG_PRINT_STAT
comment it out, and it won't print any stats.

-- 
fenrir

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