Freeze (pause) live input?

deckard97's picture


I'm looking to freeze a live input (video input or BlackSyphon as we're using Intensity Extreme cards) with a trigger.

I guess I should use an accumulator but I'm new to this.

Could the frame just be held in memory or should it be sent to the hard drive?

Ideally there would be a simple toggle to hold and release the frame, just as you hit play/pause in QuickTime Player for example, but with live video.

Thanks for the help.


Movie Loader slowing down

zulli114's picture

I saw this posting on the movie loader and works pretty well.

great tutorial on movie loader.

They mention about changing the rate to slow it down.
Does anyone know where in the javascript I could do that instead of jumping frames. Always giving credit.

function (__number position, __boolean reset) main (__number inputNumber[8], __number duration) { var result = new Object(); var slice = duration/8;

if(inputNumber[0]>0){ result.position = slice*1-slice; result.reset = true; } else

if(inputNumber[1]>0){ result.position = slice*2-slice; result.reset = true; } else

if(inputNumber[2]>0){ result.position = slice*3-slice; result.reset = true; } else

if(inputNumber[3]>0){ result.position = slice*4-slice; result.reset = true; } else

if(inputNumber[4]>0){ result.position = slice*5-slice; result.reset = true; } else

if(inputNumber[5]>0){ result.position = slice*6-slice; result.reset = true; } else

if(inputNumber[6]>0){ result.position = slice*7-slice; result.reset = true; } else

if(inputNumber[7]>0){ result.position = slice*8-slice; result.reset = true; } else{ result.reset=false; }

return result; }

Choose Audio Input Source

Tron's picture


I've been trying to figure out how to stream the music from my computer (iTunes, VLC, whatever...) into quartz's audio input patch. However, it seems that the only option for me is to run a cable from the audio-out of my computer to a mixer and then back to the audio-in, if I want to be able to hear the sound as well. Has anyone come up with another way to do this? Is there an option to change the input anywhere in the setting for quartz composer? Or is there a patch that allows the selection of other sources?

Thanks, Tron

Audio input help

bturntable's picture

I am very new to QC and was hoping someone might have some advice. I am looking to use an audio input to control the SMPTE of a quicktime movie. i.e. as audio input increases, the movie progresses and when it decreases, the movie rewinds... Any thoughts as to how this would be possible in QC?

Any help much appreciated!

Video input patch - capture size?

Gummibando's picture

Hi everybody,

I've been working on some (really basic :) augmented reality stuff for the last few days which I want to be presented in a POS style fashion, e.g. a portrait oriented display with a mounted, external (USB) camera.

For some reason the Quartz Composer "Video Input" patch captures the signal from external USB video class (UVC) cameras in their native video size, for instance 1600x1200 (high-end OSX Logitech something) or 1280x960 (XBox Camera) pixels. Which - as this is obviously an uncompressed YCrCb 4:2:2 video stream - easily saturates the USB bus, which leads to slow frame rates and/or image tearing. As UVC is generally supported in OSX since 10.4.9 there is no prefs app or setting to reduce the capture size. The image of the built-in iSight is captured at 640x480 pixels in QC, even though the iSight has a higher native video size (1280x1024 if I remember correctly).

So, pretty long story, short question.

Is there an alternative video input patch where you can modify the capture/output size?

The QC built-in "Video Input" patch once had such settings but unfortunately this was removed in QC3/OSX 10.5, according to the QC3 release notes.

Thanks in advance. Take care, Oli