[PD] Fading between 4 videos - performance issues

[chris clepper]

On 12/20/05, Nuno Godinho <eu at nunogodinho.com> wrote:
> Hi there,
>
> Meanwhile I managed to vastly improve the performance by abandoning tweaking
> with the alpha of each video and going back to pix_mix again. The trick was
> to turn off "gemhead" and also "auto" on pix_film whenever one of the films
> is totally invisible. This way I never get more than 2 videos
> simultaneously.

That's interesting since disabling the gemhead also effectively turns
off the 'auto' message as well.  Maybe there is a problem with the way
the film playback is tasked using the external API (avi or qt).  Can
you send the patches of both the pix_mix and alpha blend versions?

cgc

> I still get some delays but I'd say nothing tragic.
>
> Thanks for all your help guys.
>
> Bye,
> Nuno
>
>
> > -----Original Message-----
> > From: cgclepper at gmail.com [mailto:cgclepper at gmail.com] On
> > Behalf Of chris clepper
> > Sent: terça-feira, 13 de Dezembro de 2005 17:22
> > To: Nuno Godinho
> > Cc: PD list
> > Subject: Re: [PD] Fading between 4 videos - performance issues
> >
> > On 12/13/05, Nuno Godinho <eu at nunogodinho.com> wrote:
> > > Hi,
> > >
> > > This is a P4 at 3.2GHz with 1Gb of RAM and an ATI 9600
> > video card. Not
> > > the best in the world but I would say its acceptable for my intents.
> > >
> > > Hum...  so, from what you say... what I want to do is indeed
> > > performance intensive. But how can this be if in Adobe
> > Premiere I can
> > > run much more videos simultaneously and still apply some
> > filters on the fly?
> >
> > Premiere is probably not texturing the video using OpenGL,
> > but rather using simple accelerated overlays.
> >
> > > How do you intend to improve things?
> > > What alternativs do I have?
> > > Does it run smoothly in Mac? Is this a PC-only issue?
> >
> > I easily get 4 720p24 clips on a dual G5 and at least 3 1080i60 ones.
> > At least 6 DV clips are possible as well.
> >
> > > I thought the idea of turning off the invisible videos was
> > quite reasonable.
> > > But somehow pd takes over 1 second to react and turn one
> > video on or off.
> >
> > That should be a reasonable solution and I haven't seen the
> > same thing happen here with turning the gemhead on and off.
> > I do have a problem where the first time I turn on rendering
> > with a DirectShow or Quicktime object the output is like one
> > frame every few seconds.
> > Turning rendering off and back on makes everything run at full speed.
> > Maybe try your DV clips as Quicktime rather than AVI?
> >
> > > I could use a slightly slower framerate... But this would only be a
> > > temporary solution.
> >
> > I only have the FireGL here, but I might try an Nvidia card
> > to see if anything changes.
> >
> > > Thanks,
> > > Nuno
> >
>
>
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