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Hi Nuno<br>
I guess I shouldn't promote an alternative to GEM here but did you try
EyesWeb? (<a class="moz-txt-link-abbreviated" href="http://www.eyesweb.org">www.eyesweb.org</a>). Its a free windows software mainly for
analysing video input but also have some transformation stuff. There is
a probably a simple patch showing you a mixing of two streams. I am
myself using eyesweb for basic video analysis connected to pd for more
processing and sound generation stuff. <br>
Anyway, mixing 4 different files seems to be an quite simple task not
requring too much video card facilities. My experience is that the
decoding takes much more cpu time than anything else. I would recommend
you to try AVI format with the old (but fast decoding) compression
cinepak. Cinepak is included in the xp distribution and can also be
viewed in quicktime on a mac as far as I know.<br>
/Anders<br>
<br>
Nuno Godinho wrote:
<blockquote cite="midE1EmAYs-0002np-00@mail.iem.at" type="cite">
<pre wrap="">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
</pre>
<blockquote type="cite">
<pre wrap="">-----Original Message-----
From: <a class="moz-txt-link-abbreviated" href="mailto:cgclepper@gmail.com">cgclepper@gmail.com</a> [<a class="moz-txt-link-freetext" href="mailto:cgclepper@gmail.com">mailto:cgclepper@gmail.com</a>] 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 <a class="moz-txt-link-rfc2396E" href="mailto:eu@nunogodinho.com"><eu@nunogodinho.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi,
I am running 4 videos and I want to fade between them.
</pre>
</blockquote>
<pre wrap="">Moving a MIDI
</pre>
<blockquote type="cite">
<pre wrap="">slider (ctlin 0..127) I assign a range to each video
</pre>
</blockquote>
<pre wrap="">(0..30, 30..60,
</pre>
<blockquote type="cite">
<pre wrap="">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
</pre>
</blockquote>
<pre wrap="">for GEM in my PC.
</pre>
<blockquote type="cite">
<pre wrap="">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
</pre>
</blockquote>
<pre wrap="">to turn it
</pre>
<blockquote type="cite">
<pre wrap="">on/off I sometimes get a delay of over 1 second before that
</pre>
</blockquote>
<pre wrap="">video turns on or off.
</pre>
<blockquote type="cite">
<pre wrap="">Here attached I send my patches. "vela.pd" is the main one.
Any ideas?
Thanks in advance,
Nuno
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