[PD] Fading between 4 videos - performance issues

[Nuno Godinho]

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?

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 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.

I could use a slightly slower framerate... But this would only be a
temporary solution.

Thanks,
Nuno


> -----Original Message-----
> From: cgclepper at gmail.com [mailto:cgclepper at gmail.com] On 
> Behalf Of chris clepper
> Sent: segunda-feira, 12 de Dezembro de 2005 16:34
> To: Nuno Godinho
> Cc: PD list
> Subject: Re: [PD] Fading between 4 videos - performance issues
> 
> What kind of hardware are you using?  I have a 3.4 Ghz P4 HT 
> with a FireGL card and it struggles to play 4 640x480 
> Photo-jpeg QT clips at 30fps.  The CPU load on a 
> HyperThreaded machine is misleading as Windows thinks there 
> are two actual CPUs which isn't the case.  So 50% load 
> usually means the thing is hammered.
> 
> Texturing performance under Windows seems pretty awful and 
> DirectShow and Quicktime aren't much better.  I'm looking 
> into improving things...
> 
> On 12/12/05, Nuno Godinho <eu at nunogodinho.com> wrote:
> > Hi,
> >
> > I am running 4 videos and I want to fade between them. 
> Moving a MIDI 
> > slider (ctlin 0..127) I assign a range to each video 
> (0..30, 30..60, 
> > 60..90,
> > 90..127) and then fade between them.
> >
> > Although the logic is working, the performance is unacceptable. The 
> > CPU is only running at 40% but the videos look slow and the 
> > transitions aren't smooth.
> >
> > I figured this is because 4 simultaneous films is too much 
> for GEM in my PC.
> > So I implemented a way to turn off each film when its transparency 
> > equals 0 since it is not showing anyway.
> >
> > The problem now is that when I send "1" or "0" to gemhead 
> to turn it 
> > on/off I sometimes get a delay of over 1 second before that 
> video turns on or off.
> >
> > Here attached I send my patches. "vela.pd" is the main one.
> >
> > Any ideas?
> >
> > Thanks in advance,
> > Nuno
> >
> >
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