Forums > Jitter

how to video fade out over time

May 16, 2007 | 4:49 am

I have a basic Jitter patch based on a Midi keyboard that triggers QuickTime video clips; each key stroke plays a different clip in the window.
I want the video clips to slowly fade out to black after hitting a key on the keyboard about a couple of seconds after the key was hit, a bit like hitting one piano key and listening to the room harmonics slowly fade out into silent.

How do I do that?

thanks.


May 16, 2007 | 5:04 am

Depends on your patch. You could jit.xfade to black, slowly set the
alpha of a video plane to 0 with blend_enable 1, jit.op @op * to 0 to
make the video go away etc. etc.

wes

On 5/15/07, Doron Altaratz wrote:
>
> I have a basic Jitter patch based on a Midi keyboard that triggers QuickTime video clips; each key stroke plays a different clip in the window.
> I want the video clips to slowly fade out to black after hitting a key on the keyboard about a couple of seconds after the key was hit, a bit like hitting one piano key and listening to the room harmonics slowly fade out into silent.
>
> How do I do that?
>
> thanks.
>
>


May 16, 2007 | 10:06 am

Thanks WES,
But how do I make the video fade to black over a certain period of time, for example I want to make the video fade out to black gradually exactly 5 seconds after the user clicked the midi key.
I want to tell Jitter to perform the fade out of the video automatically by itself, not by control of the user.
I guess I’m looking for some kind of an automatic transition system.
Thanks
D.


May 16, 2007 | 10:13 am

have a look at the ‘line’ or ‘bline’ objects – they let you trigger a
ramp of values from a start to an end point over a specified time.

-deKam

>
> Thanks WES,
> But how do I make the video fade to black over a certain period of
> time, for example I want to make the video fade out to black
> gradually exactly 5 seconds after the user clicked the midi key.
> I want to tell Jitter to perform the fade out of the video
> automatically by itself, not by control of the user.
> I guess I’m looking for some kind of an automatic transition system.
> Thanks
> D.


May 17, 2007 | 12:18 am

I have a patch on my website that demos how to use a floating num box with line to create a ramp (it’s a little more useful than that, but that’s the heart of it).

Go to http://www.hellbender.org and follow the link to "Max/MSP/Jitter Programming". Then, download "ike.gain~"

It’s an audio-based example, but the logic should be clear and you can adapt it to stick with floating-point info.

You can then attach the output to a brcosa object or whatever object you want for the fade to black.

Adam


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