[PD] Fading between 4 videos - performance issues

[Anders Friberg]

Hi Nuno
I guess I shouldn't promote an alternative to GEM here but did you try 
EyesWeb? (www.eyesweb.org). 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.
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.
/Anders

Nuno Godinho 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?
>
>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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>>>
>>>
>>>
>>>      
>>>
>
>
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