Cycling 74 » Topic: xfade and uneven output from line http://cycling74.com/forums/topic/xfade-and-uneven-output-from-line/feed Wed, 19 Jun 2013 09:24:58 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/xfade-and-uneven-output-from-line/#post-54999 <![CDATA[xfade and uneven output from line]]> http://cycling74.com/forums/topic/xfade-and-uneven-output-from-line/#post-54999 Wed, 16 Feb 2011 15:03:04 +0000 jemfiner I am trying to use Jitter to animate still images (1536 x 1024 pixels) by crossfading from one to another using xfade. The patch enclosed is what I am using to send values to xfade.

This all works in theory but I am finding that the values output from line are unpredictable. sometimes it runs smoothly from 0.0 to 1.0 and back again, sometimes it sticks and then picks up a bit later.

I’ve had a look at scheduling prefs and reduced scheduler slop to 1ms, overdrive is off. My mac is 2.5 Ghz, with 3 GB RAM.

Is it simply a case that my computer is not powerful enough to crossfade images of this size smoothly, or are there ways (I hope so !) that I can optimise MaxMSP to give a consistent smooth ramp of values from line, and hence a beautiful smooth crossfade ?

– Pasted Max Patch, click to expand. –

Thanks very much,

Jem

]]> http://cycling74.com/forums/topic/xfade-and-uneven-output-from-line/#post-198047 <![CDATA[Re: xfade and uneven output from line]]> http://cycling74.com/forums/topic/xfade-and-uneven-output-from-line/#post-198047 Wed, 16 Feb 2011 17:25:50 +0000 antialias Have a look at Recipe 31 (Animator)– there’s a technique for using cpuclock to drive animations smoothly.

]]> http://cycling74.com/forums/topic/xfade-and-uneven-output-from-line/#post-198048 <![CDATA[Re: xfade and uneven output from line]]> http://cycling74.com/forums/topic/xfade-and-uneven-output-from-line/#post-198048 Wed, 16 Feb 2011 18:38:26 +0000 jemfiner That looks promising, thanks for pointing me in its direction.

Jem

]]> http://cycling74.com/forums/topic/xfade-and-uneven-output-from-line/#post-198049 <![CDATA[Re: xfade and uneven output from line]]> http://cycling74.com/forums/topic/xfade-and-uneven-output-from-line/#post-198049 Wed, 16 Feb 2011 18:57:59 +0000 jemfiner If one has to use metro to trigger cpuclock, is one then not back in the vagaries of timing that using cpuclock is trying to avoid ?

Thanks

Jem

]]> http://cycling74.com/forums/topic/xfade-and-uneven-output-from-line/#post-198050 <![CDATA[Re: xfade and uneven output from line]]> http://cycling74.com/forums/topic/xfade-and-uneven-output-from-line/#post-198050 Wed, 16 Feb 2011 21:24:33 +0000 Rob Ramirez line generally has more reliable timing with Overdrive turned on, i believe.

also, you might want to try bline instead of line.

]]> http://cycling74.com/forums/topic/xfade-and-uneven-output-from-line/#post-198051 <![CDATA[Re: xfade and uneven output from line]]> http://cycling74.com/forums/topic/xfade-and-uneven-output-from-line/#post-198051 Wed, 16 Feb 2011 22:43:08 +0000 jemfiner Regarding overdrive, the “setting scheduler prefs” documentation advises leaving it off if you are primarily using Jitter, which I am. It seems to be better off.

I’ll have a look at bline, thanks.

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