[PD] Fading between 4 videos - performance issues
Nuno Godinho
eu at nunogodinho.com
Tue Dec 20 17:41:19 CET 2005
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.
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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