[MPlayer-dev-eng] [RFC] preliminary x264 encoding help text

[Guillaume Poirier]

Hi,

On Apr 10, 2005 3:24 PM, Alexander Strasser <eclipse7 at gmx.net> wrote:
> Loren Merritt wrote:
> > On Sun, 10 Apr 2005, The Wanderer wrote:
> > >Jeff Clagg wrote:
> > >
> > >>Before continuing, I should explain that I'm using only one quality
> > >>metric: global PSNR. This is reported as the last PSNR number reported
> > >>when you include the "psnr" option in x264encopts. Any time I make a
> > >>claim about PSNR, one of the assumptions behind the claim is that equal
> > >>bitrates are used.
> > >
> > >I'm not sure it's worth explaining it here, but I'll note (as I've done
> > >recently) that not everyone trying to do encoding knows what PSNR stands
> > >for; especially if this guide is in any way aimed at encoding newbies,
> > >it might be good to expand the term in parentheses at the first usage.
> >
> > I disagree. Either you know what PSNR is, or it requires a lengthy
> > explanation, or you just hand-wave it as "quality". Knowing what it
> > stands for doesn't help unless you're going to explain it.
> 
>   As PSNR is nothing special to a particular codec, we might want to
> explain it and some similar terms in one playe somewhere else.
> 
>   I know it is questionable if this belongs into mplayer docs, but it
> is an option.

Maybe we could just say it's a figure that somewhat refers to the
quality/fidelity of the encode, and give a link to the wikipedia:
http://en.wikipedia.org/wiki/PSNR ?

Regards,
Guillaume