Cycling 74 » Topic: Fade out audio after crossing video motion threshold http://cycling74.com/forums/topic/fade-out-audio-after-crossing-video-motion-threshold/feed Wed, 19 Jun 2013 04:39:56 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/fade-out-audio-after-crossing-video-motion-threshold/#post-66427 <![CDATA[Fade out audio after crossing video motion threshold]]> http://cycling74.com/forums/topic/fade-out-audio-after-crossing-video-motion-threshold/#post-66427 Sun, 10 Feb 2013 04:01:31 +0000 iamdabobo I’m having trouble googling this because I don’t know what to call it.

Basically, I’m using a webcam to control the volume of sound in a room. If nobody is in the room, the sound shouldn’t play. However, this needs to have a reasonably long time-out value so that it doesn’t accidentally stop playing while there are people in the room.

So I’ve got a jit.qt.grab, going to a jit.change with a reasonably high threshold value. My playback is controlled by 4 play~ objects through a 4-channel live.gain~ object.

How do I extract the motion data from jit.change and give it to live.gain with a timeout so as to accomplish my purposes?

Thanks in advance

]]> http://cycling74.com/forums/topic/fade-out-audio-after-crossing-video-motion-threshold/#post-239132 <![CDATA[Re: Fade out audio after crossing video motion threshold]]> http://cycling74.com/forums/topic/fade-out-audio-after-crossing-video-motion-threshold/#post-239132 Sun, 10 Feb 2013 11:17:06 +0000 LSka I’d suggest you using cv.jit externals to perform a more precise tracking. http://jmpelletier.com/cvjit/
In this example, I’m using [cv.jit.label] and [cv.jit.blobs.centroids] to track the presence of people in the room.
Then, the output of the [cv.jit.blobs.centroids] triggers a [line~] object connected to a [*~] generating a volume ramp.

– Pasted Max Patch, click to expand. –

hope it helps.

]]> http://cycling74.com/forums/topic/fade-out-audio-after-crossing-video-motion-threshold/#post-239133 <![CDATA[Re: Fade out audio after crossing video motion threshold]]> http://cycling74.com/forums/topic/fade-out-audio-after-crossing-video-motion-threshold/#post-239133 Sun, 10 Feb 2013 11:52:30 +0000 Stephane Morisse The qmetro can do all this voodoo by itself ? :))

]]> http://cycling74.com/forums/topic/fade-out-audio-after-crossing-video-motion-threshold/#post-239134 <![CDATA[Re: Fade out audio after crossing video motion threshold]]> http://cycling74.com/forums/topic/fade-out-audio-after-crossing-video-motion-threshold/#post-239134 Sun, 10 Feb 2013 17:10:48 +0000 LSka Yes, qmetro is a very powerful object, if you connect it to something else :)

Sorry for messing with copy & paste….
Here should be the right patch

– Pasted Max Patch, click to expand. –
]]> http://cycling74.com/forums/topic/fade-out-audio-after-crossing-video-motion-threshold/#post-239135 <![CDATA[Re: Fade out audio after crossing video motion threshold]]> http://cycling74.com/forums/topic/fade-out-audio-after-crossing-video-motion-threshold/#post-239135 Mon, 11 Feb 2013 00:03:43 +0000 iamdabobo LSka, I’m not sure what your example is–the posted code is just a qmetro.

I have a metro connected to the qt.grab, which outputs fps (i guess?) Not sure how it does that. However, I’m having a hard time getting reasonable results with the actual fps numbers. It doesn’t just nicely decrease to zero, so I can’t just pick an fps threshold (I think)

I’m currently looking into cv.jit; I’ll see how that goes.

edit: sorry, I just saw your updated post.

]]> http://cycling74.com/forums/topic/fade-out-audio-after-crossing-video-motion-threshold/#post-239136 <![CDATA[Re: Fade out audio after crossing video motion threshold]]> http://cycling74.com/forums/topic/fade-out-audio-after-crossing-video-motion-threshold/#post-239136 Mon, 11 Feb 2013 01:29:05 +0000 iamdabobo edit: i’m dumb, thank you so much!

Thanks

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