[MEncoder-users] encoding technical question

[Raimund Berger]

"Guillaume POIRIER" <poirierg at gmail.com> writes:

> Yes indeed. encoding-tips.txt has been only kept as a "casual
> reference": your should really only read the recommendations at the
> bottom of this section:
> http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-dvd-mpeg4.html#menc-feat-dvd-mpeg4-resolution-bitrate-compute

Incidentally, a little question regarding those resolution
computations.

As I see it, the calculated ResX is the horizontal display resolution,
which of course differs from the encoding resolution in case of
anamorphic DVD encodings.

Much the same, I wouldn't call ARc the "encoded aspect ratio", but
rather the "display" aspect ratio.

It *might* make sense to use the latter for bit/pixel quality
calculations, although the quality loss "encoded ar -> display ar" is
imo really determined by the playback scaler.

But, and that's the question, if I scale down to reach a certain CQ,
wouldn't I in case of anamorphic DVDs again want an anamorphic
encoding with horizontal resolution ResX/PAR, where PAR corresponds to
that ARa/PRdvd quotient and e.g. equals 32/27 in case of NTSC
widescreen, rather than ResX horizontal res and PAR 1 ?

The terminology there seems slightly misleading to me ....