On 12/20/05, Nuno Godinho eu@nunogodinho.com wrote:
Hi there,
Meanwhile I managed to vastly improve the performance by abandoning tweaking with the alpha of each video and going back to pix_mix again. The trick was to turn off "gemhead" and also "auto" on pix_film whenever one of the films is totally invisible. This way I never get more than 2 videos simultaneously.
That's interesting since disabling the gemhead also effectively turns off the 'auto' message as well. Maybe there is a problem with the way the film playback is tasked using the external API (avi or qt). Can you send the patches of both the pix_mix and alpha blend versions?
cgc
I still get some delays but I'd say nothing tragic.
Thanks for all your help guys.
Bye, Nuno
-----Original Message----- From: cgclepper@gmail.com [mailto:cgclepper@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@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
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