[PD] Fading between 4 videos - performance issues

[Nuno Godinho]

Hi there,

I tried to use Quicktime instead of DV. The 4 clips are like 10x bigger and
the problem remains unchanged. 

I also tried to add some [change] objects wondering if I wasn't unecessarily
stressing some objects forcing repeated calculations but still everything is
slow as a rowing boat.

I even removed 2 clip leaving only 2, and still everything was slow. I even
tried with only one clip and noticed that, although the clips was running
smoothly [ctlin] had a significant delay and after I moved the fader would
only reflect the changes after almost one second. Weird, isn't it?

Since I received that email from Chris Klippel suggesting I am overloading
the buffers, I think I will give pix_mix another try. I guess the mix in
pix_mix is done before the buffers, right?

Thanks,
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
>