Cycling 74 » Topic: Motion Detection and quicktime http://cycling74.com/forums/topic/motion-detection-and-quicktime/feed Thu, 20 Jun 2013 02:36:03 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-34804 <![CDATA[Motion Detection and quicktime]]> http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-34804 Thu, 29 Nov 2007 05:14:27 +0000 Jimbuck Greetings folks. I am putting the finishing touches on a patch that deals with triggering 4 movie clips based on motion detection in the space. The videos will be in a loop roughly 12 minutes a piece, played simultaneously crossfading between one another based on motion.

I was wondering a few things.

1. A solution to crossfade the audio linearly with the video since they are packaged in a quicktime and loaded into max. Ideally the audio and video should sync up.

2. I am installing this project using a dual-2.0 G5 tower. It has 2 GB RAM, and a 128mb video card. I was wondering if this will be enough to allow the patch to run smoothly. Video is rendered as qt using motion jpeg at 640×480 and 16-bit audio not compressed.

If someone has similiar experience with either issue I would be very interested in hearing what you have to say. I’ve attached the patch below. Thanks everyone.

]]> http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-117978 <![CDATA[Re: Motion Detection and quicktime]]> http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-117978 Thu, 29 Nov 2007 12:22:27 +0000 lists@lowfrequency.or I did a similar thing using full-res PAL and photojpeg, and using a
few basic effects and jit.gl.slabs. It barely eked out 15-18 fps,
and it was a dual 2.7GHz machine with a better graphics card. Of
course, hard drive bandwidth is an issue, so don’t try running this
off the internal drive – get one or more FW800 drives, or a single
RAIDed FW800 drive, if possible. If you do 3 movies, it will work
better.

OR – even better, don’t load 4 separate movies. Edit them into a
single movie, load them into RAM, and use 4 “playheads” to control it
and route it to 4 different destinations – there is an example in the
jitter-examples folder called “multi-playheads” or something similar
that demonstrates this technique.

Cheers
Evan

On Nov 29, 2007, at 5:14 AM, JimBuck wrote:

> Greetings folks. I am putting the finishing touches on a patch that
> deals with triggering 4 movie clips based on motion detection in
> the space. The videos will be in a loop roughly 12 minutes a piece,
> played simultaneously crossfading between one another based on motion.
>
> I was wondering a few things.
>
> 1. A solution to crossfade the audio linearly with the video since
> they are packaged in a quicktime and loaded into max. Ideally the
> audio and video should sync up.
>
> 2. I am installing this project using a dual-2.0 G5 tower. It has 2
> GB RAM, and a 128mb video card. I was wondering if this will be
> enough to allow the patch to run smoothly. Video is rendered as qt
> using motion jpeg at 640×480 and 16-bit audio not compressed.
>
> If someone has similiar experience with either issue I would be
> very interested in hearing what you have to say. I’ve attached the
> patch below. Thanks
> everyone._____________________________________
> __________

]]> http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-117979 <![CDATA[Re: Motion Detection and quicktime]]> http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-117979 Thu, 29 Nov 2007 13:24:50 +0000 Jean-Francois Charles

]]> http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-117980 <![CDATA[Re: Motion Detection and quicktime]]> http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-117980 Fri, 30 Nov 2007 17:34:08 +0000 azs What sort of problems would you run into if you were using too many playheads and sfplays simultaneously?

]]> http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-117981 <![CDATA[Re: Motion Detection and quicktime]]> http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-117981 Fri, 30 Nov 2007 19:15:37 +0000 Jean-Francois Charles

]]> http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-117982 <![CDATA[Re: Motion Detection and quicktime]]> http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-117982 Sat, 01 Dec 2007 00:01:29 +0000 azs I realize that the multiple playhead method of playing multiple sections of a quicktime requires synching the audio using an audio file and msp objects. I’m okay with that. I’ve been working on a project using jit.gl.slabs. My quicktimes are only 320×240, 15fps, photo-jpeg. I’m not using effects and I really don’t care about the quality of the image. The movies will follow the movement of lights being tracked using cv.jit.blobs.bounds. I understand how to do this with matrix repositioning, but I started looking at OpenGL objects to find a simpler, less processor intensive solution. Now I think that multiple playheads might work better. My question is this: If I kept adding multiple playheads and sfplays, would it slow down the patch sooner than if I kept adding jit.gl.slabs? Also, should I have started a new thread? Sorry about the vague question earlier.

]]> http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-117983 <![CDATA[Re: Motion Detection and quicktime]]> http://cycling74.com/forums/topic/motion-detection-and-quicktime/#post-117983 Sat, 01 Dec 2007 20:54:56 +0000 Rob Ramirez > My question is this: If I kept adding multiple playheads and sfplays, would it slow down the patch sooner than if I kept adding jit.gl.slabs?

comparing apples and oranges, so the question doesn’t really have an answer. *usually* processing your videos on the gpu will be more efficient, but this doesn’t seem to be what you’re asking.

> Also, should I have started a new thread?

probably.

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