[MPlayer-DOCS] encoding-guide: outdated description of x264enc options?

[Andrew Savchenko]

Hi!

On 6 Jan 2007 22:02 Guillaume POIRIER wrote:
> Hi,
>
> On 1/6/07, Andrew Savchenko <Bircoph at list.ru> wrote:
> > It seems that description of x264 encoding options is slightly
> > outdated. Into paragraph "Options which primarily affect speed
> > and quality" in description of the subq opion anyone can see:
> > ----------
> > subq=6 is the slowest, highest quality mode.
> > ----------
> >
> > But in the manual:
> > ----------
> > 6    Enables  rate-distortion optimization of macroblock types
> > in I- and P-frames.
> > 7    Enables rate-distortion optimization of motion  vectors 
> > and intra modes. (best)
> > ----------
> > So, subq=7 seems to be the highest quality mode. Probably it
> > sould be describded instead of subq=6. Or its quality gain is
> > negligible in comparision with speed loss and it is considered
> > as unrecommended?
> >
> >From my experience, subq=7 can improve PSNR between 0,01dB and
> > 0,02dB,
>
> and slows down encoding by about 33% compared to subq=6.
> Because this introduces a significant slowdown without a
> significant improvement in quality, I wouldn't recommend using
> it unless you're after every bit of quality improvement.

Thanx, now it is clearer for me.

> Andrew do you plan to update this section, or would you prefer
> let me do it?

You know mencoder internals much better than mine, so I prefer your 
docs alteration. I'm not sure I'll do this properly.
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