[PD] Fading between 4 videos - performance issues

[chris clepper]

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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