Cycling 74 » Topic: jitter and audio with max for live http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/feed Wed, 19 Jun 2013 14:25:30 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-53821 <![CDATA[jitter and audio with max for live]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-53821 Thu, 09 Dec 2010 00:09:29 +0000 benoit-1842 When I use my camera in a jitter project live (filming me live), my sound glitch sometime like a cd skipping or a vinyl crackling…. But my cpu is not too high like 14-15 %….How I can avoid that ? Is there a trick I can do or it’s normal….

Thanx in advance Ben

]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193730 <![CDATA[Re: jitter and audio with max for live]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193730 Thu, 09 Dec 2010 11:00:49 +0000 Olivier Sebillotte Hi Benoit,

CPU meters are not always accurate, they are more like a VU meter than a peak meter
So I guess Jitter is asking too much sometimes
Maybe there is some optimization to do in your patcher or some changes in Max audio preferences ( buffer settings)

you can post an example here so we could test it

olivier

]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193731 <![CDATA[Re: jitter and audio with max for live]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193731 Fri, 10 Dec 2010 01:28:43 +0000 Emmanuel Jourdan You might want to make sure that you use qmetro, and not metro. A Max for Live device uses always scheduler in audio interrupt which is great for tight even precision, but that’s not what you want to use for triggering video.

]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193732 <![CDATA[Re: jitter and audio with max for live]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193732 Fri, 10 Dec 2010 09:05:35 +0000 Olivier Sebillotte hm,
Interesting.
thanks Emmanuel.

Is it still true when we edit a m4l device ?

olivier

]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193733 <![CDATA[Re: jitter and audio with max for live]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193733 Tue, 14 Dec 2010 15:24:25 +0000 Emmanuel Jourdan Yes it is. You can see overdrive is disabled in the options menu.

]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193734 <![CDATA[Re: jitter and audio with max for live]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193734 Tue, 14 Dec 2010 16:47:16 +0000 Olivier Sebillotte ha ! , you mean Overdrive

that’s not exactly how I understand Overdrive from the manual

I don’t want to sound ironic Emmanuel, I am just curious.

http://cycling74.com/docs/max5/vignettes/core/scheduler_preferences.html

“Overdrive
When Overdrive is enabled, Max gives priority to timing and MIDI processing over screen drawing and user interface tasks such as responding to mouse clicks. As a general rule: if you are primarily going to be using Max for MIDI or audio processing, Overdrive should be enabled. If you are primarily going to be using Jitter, Overdrive should be disabled. In addition, the debugging features of Max only work if overdrive is disabled.”

]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193735 <![CDATA[Re: jitter and audio with max for live]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193735 Wed, 15 Dec 2010 20:19:56 +0000 Emmanuel Jourdan When overdrive and scheduler in audio interrupt are on, which is the case in Max for Live, it allows you to have really tight precision for playing notes and event in general. When you’re playing with video, you don’t really care about time precision the same way (if a frame arrive a couple of ms later that’s not an issue, cos’ your eyes probably won’t see the difference ). That’s why you should always use qmetro for playing video, it does play the video with a lower priority, maintaining the precise timing for the events that need to be in sync.

On the subject, Joshua’s article is worth to look at.

]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193736 <![CDATA[Re: jitter and audio with max for live]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193736 Fri, 17 Dec 2010 10:50:10 +0000 Olivier Sebillotte “scheduler in audio interrupt”

I knew about overdrive but not about this last one,

now it makes sense.

Thanks Emmanuel

olivier

]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193737 <![CDATA[Re: jitter and audio with max for live]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193737 Thu, 23 Dec 2010 08:31:15 +0000 benoit-1842 Thanx a lot…Merci beaucoup…When I have put overdrive off (I hope) my problem was resolve….

Thanx a lot an merry christmas from Québec !!!!!

]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193738 <![CDATA[Re: jitter and audio with max for live]]> http://cycling74.com/forums/topic/jitter-and-audio-with-max-for-live/#post-193738 Thu, 23 Dec 2010 14:09:29 +0000 Olivier Sebillotte :-)

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