Expressions/Scripts/Presets

Moderators: Disciple, zlovatt

 
oscarus
Topic Author
Posts: 9
Joined: Mon Jul 12, 2004 4:35 pm
Location: Paris
Contact:

To rhythm a video according to a sound

Mon Feb 14, 2005 1:45 pm

This expression allows you to manipulate time remapping on video layers in accordance with audio layers (fast-forward/freeze frame/rewind/...)

You might need to tweak the sound a little so that it contains clear frequency amplitudes.

Here is how to use it :

First of all convert the audio to kyeframes : Animation>keyframe assistant>Convert audio to keyframes. You get an "Audio Amplitude" layer. The expression only takes into account the keyframes of the "Both channels" stream, so you can consequently delete the "Left" and "Right" channel streams.

Next step is to apply three times the "Slider Control" effect to the Video layer you want to affect. Name them : "frequence min", "frequence max" and "frames"
(you can also use custom names, but correct them accordingly in the expression code).

Finally, apply the expression to the "Time remapping" property of the video layer.

Here two examples :

http://oscarvideo.free.fr/remap_ar.mov
http://oscarvideo.free.fr/remap_av.mov

and here is the expression :

t=timeToFrames(inPoint);i=0; 
while(timeToFrames()>=t)
{
min=effect("frequence min")(1).valueAtTime(framesToTime(t));max=effect("frequence max")(1).valueAtTime(framesToTime(t));a=effect("frames")(1).valueAtTime(framesToTime(t));
f=thisComp.layer("Amplitude audio").effect("Les deux couches")("Curseur").valueAtTime(framesToTime(t));
if(f>=min && f<=max){i+=1-a}
t++;
}
timeRemap.valueAtTime(time-framesToTime(i))
 
jonnyquest45
Posts: 5
Joined: Sun Feb 20, 2005 3:42 pm

Mon Feb 21, 2005 8:14 am

effect("Les deux couches")
im a bit confused abut the above line
i know it means two layers
but what effect is this refering too.
 
Shinjipierre
Posts: 36
Joined: Sat Dec 04, 2004 10:10 am

Mon Feb 21, 2005 10:58 am

eheh, Thta's because he's using the french version of after effects.

One should careful when coding script :p

English scripts work for all languages, but ther languages only work on their own version ^^.

"Les 2 couches" = "Both channels"

("Curseur") won't work either ^^.
 
jonnyquest45
Posts: 5
Joined: Sun Feb 20, 2005 3:42 pm

Mon Feb 21, 2005 1:13 pm

Shinjipierre wrote:

("Curseur") won't work either ^^.

and just to be a total non french speaking person
what word should i use in this case
 
Shinjipierre
Posts: 36
Joined: Sat Dec 04, 2004 10:10 am

Mon Feb 21, 2005 3:48 pm

Hummm, I've tried your expression... I don't really know how I should configure the 3 sliders, if you could tell us a bit more ...
 
oscarus
Topic Author
Posts: 9
Joined: Mon Jul 12, 2004 4:35 pm
Location: Paris
Contact:

Wed Feb 23, 2005 5:55 am

Hello jonnyquest45 and Shinjipierre !

Here the expression for the English version :

Code :

t=timeToFrames(inPoint);i=0;
while(timeToFrames()>=t)
{
min=effect("frequence min")(1).valueAtTime(framesToTime(t));max=effect("frequence max")(1).valueAtTime(framesToTime(t));a=effect("frames")(1).valueAtTime(framesToTime(t));
f=thisComp.layer("Audio Amplitude").effect("Both Channels")(1).valueAtTime(framesToTime(t));
if(f>=min && f<=max){i+=1-a}
t++;
}
timeRemap.valueAtTime(time-framesToTime(i))


Oscar.
 
jonnyquest45
Posts: 5
Joined: Sun Feb 20, 2005 3:42 pm

Wed Feb 23, 2005 8:40 am

that is freaking sweet. i can think of a million difrent ways to use this
 
jonnyquest45
Posts: 5
Joined: Sun Feb 20, 2005 3:42 pm

Sat Feb 26, 2005 9:05 am

if i wanted this to effect lets say rotation
i would change the part about time remap to rotation?
sorry im new to the whole concept of expressions.
 
Lasvideo
Posts: 2
Joined: Wed Jan 05, 2005 8:04 pm
Location: Las Vegas

Sound Keys Outputs

Sat Feb 26, 2005 1:40 pm

By adding "-100 to 100" as the range for the frames slider, I can get it to reverse direction. Can anybody modify the expression to utilize the 3 outputs from Sound Keys? I tried the obvious and didnt meet with success.
 
martin
Posts: 1
Joined: Fri Mar 04, 2005 7:45 am

Fri Mar 04, 2005 8:54 am

That's such a pretty cool effect.
But I can't get it to work.
Is there a step by step tutorial?

I made everything like oscarus said.

But the Movie is just jumping fast and is not playing und jumping back & foward etc.,
Do I need a single audio and video or can a take the aufio out of the video track?

do I have to change the frequence min, - max and frames. How does it know , which frequence it should take, for example the bass drum.

Thank you guys.

Cheers

Martin
 
jonnyquest45
Posts: 5
Joined: Sun Feb 20, 2005 3:42 pm

Fri Mar 04, 2005 8:56 am

you have to set the feq max and min use the slideers you pu on the video layer. make sure your min is less then you max.
then you need to set the frames. to get it to jump back set a negitive number i like 3 frames to 5 frames for most stuff.
 
pseudojag
Posts: 2
Joined: Fri Feb 25, 2005 11:08 pm

How can expression be modified to create the following…

Fri Mar 04, 2005 10:12 am

Can anyone please explain how to modify the above expression so that the video moves forwards slowly and then jumps ahead on the specified frequencies. Just like here…

http://www.geocities.com/pseudojag/rhythmfly.mov

Thanks for any help you guys can give me


-Phil
 
ranjha
Posts: 1
Joined: Mon Feb 28, 2005 3:43 am

Fri Mar 04, 2005 11:14 am

Hi,

if you have trapcodes soundkeys, check out this thread at creativecow, it does exactly what you want.

http://www.creativecow.net/forum/read_p ... ght=ranjha

Ranjha.
 
pseudojag
Posts: 2
Joined: Fri Feb 25, 2005 11:08 pm

Trapcode

Fri Mar 04, 2005 11:40 am

Dear Ranjha,

Thanks for the link. I have Soundkeys… but could you be more specific with settings…? I tried Dan Ebbert's Sound Keys settings but all I get is a still frame of video. Maybe you could post your settings (what layer was linked to which expression, etc… for clarity's sake).

Thanks for your help

-Phil
 
Lasvideo
Posts: 2
Joined: Wed Jan 05, 2005 8:04 pm
Location: Las Vegas

Will Buy Plugin

Fri Mar 04, 2005 7:01 pm

Hey, to whoever applied for a patent relating to sound controling motion... I'd love to buy your softeware. I encourage you to market it, many people would bury you in sales Im sure!

Who is online

Users browsing this forum: No registered users and 3 guests