DVD playback - Choppy?

[Carl Potter]

I played around with DVD and did a lot of testing.

machine:  iBook (toilet seat edition) 466MHz Rage128/DVD

I don't think it really improved anything to have agpgart & DRI.
Nor did /dev/rdvd seem to do anything really significant.  The most
important factor seems to be Xv and the following:

"motion compensation" is *apparently* only done on systems that
have an Altivec processor (I read that somewhere in the code).  Whatever
the case may be, motion compensation is NOT being done on G3s.

I get better DVD playback on an Intel Celeron 400MHz with an
ATI All-in-Wonder 4mb (oldie but a goodie) ......mainly because MMX-like
optimizations are
doing the motion compensation algorithm.  Apparently this algorithm
does not do well using plain-jane CPU routines.

I don't own a G4 so I don't know how much better DVD playback is.
I'm curious to know if anyone can indeed report that motion compensation
is being done on those systems.



Shawn Coomey wrote:

> Thanks Mark-
> You may be on to something.
> I have Xv enabled and /dev/rdvd for playback.
>
> However, I don't know if direct rendering is set up for the Rage128. My
> guess is that this is probably the culprit.
>
> Any idea how to enable this?
>
> Thanks!
>
> Shawn
>
> On Thu, 2002-04-04 at 00:51, mpople@orbeng.com wrote:
> > Hi,
> > A few things that vastly improved my xine performance was to make sure i was
> > using Xv video driver and i set up my /dev/rdvd for playback and also i
> > enable direct rendering for my Rage128.
> > hope this helps
> > Mark
> >