[MEncoder-users] new doom9 codec comparission (draft 1)

[Guillaume POIRIER]

Hi,

On 12/9/05, Corey Hickey <bugfood-ml at fatooh.org> wrote:

[..]

> for i in vpass=1:turbo vpass=2 ; do
>   mencoder matrix.vob -aid 128 -oac copy \
> -vf crop=718:356:0:60,scale=640:272 -sws 9 -ovc lavc \
> -lavcopts vcodec=mpeg4:vbitrate=581:mbd=2:mv0:trell:cbp:\
> precmp=2:cmp=2:subcmp=2:predia=2:dia=2:preme=2:v4mv:\
> last_pred=2:vqcomp=0.6:vmax_b_frames=2:qpel:$i \
> -ofps 24000/1001 -o mpeg4.avi
> done

I note that you force the framerate to 24000/1001... I don't know what
kind of source doom9 is gonna use, but it may not be NTSC dvds
(mencoder need the framerate of those sources to be set). I also note
here that you did not use any inverse telecine filters. Is that
intended?
I have little experience with ntsc contents, but if I'm not mistaken,
failure to properly inverse telecine results in artifacts and bad
picture quality.

Now, doom9 is maybe using a frameserver such as avisynth which can
probably do all the filtering, I don't know.

Those are the kind of details that matter a great deal if they are
forgotten or not well made.

Guillaume
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