This is one way...maybe not the only way:
 
Create a large photoshop file that contains your entire sentence. X by
480 pixels. Save an alpha channel of the text layer. Copy the Alpha
channel contents to the RGB channel so your image not only looks black
with white text, but also has an alpha channel that looks the same.
 
Pull it into PPro, animate it on, say V1. Then export the V1 layer only
(turn other layers off if they exist to numbered Targas (containing the
alpha channel). Check the box that puts the resulting rendered/numbered
files back into your current project.
 
Next, you put your background video on V1, the video that shows through
your text on V2, the numbered Targas from previous render on V3. Apply
track matte key to V2, sourced to V3 with compositing set to Luma, not
Alpha. Turn off visibility of V3 track.
Render it and you should see nice results.
 
I've quickly explained this without telling every little step, but if
you've done this before, you'll know what I'm talking about.
 
What I learned recently is that animating a single still image (keying
the motion) does not work once the track matte is applied. It seems to
freeze the motion. Does not quite work according to manual.
Hope this works for you. If not, you could email off list and I'll
explain further.
 
I'd assume you could do this same thing using crawling text from the
titler. Still, you'd have to render only that layer to
numbered/sequential targas (or any output format that supports an alpha
channel) and bring the result back on to V3 and follow same steps above.
John
 
-----Original Message-----
From: stogrady66 [mailto:[EMAIL PROTECTED] 
Sent: Thursday, February 17, 2005 12:25 PM
To: [email protected]
Subject: [AP] Animated Track Matte Video Through Text?
 

Hello all... 

I am trying to have a scrolling title move from right to left on the 
screen with the video showing through the letters.. I have attempted 
to use the track matte key to do this however it seems to cut off the 
word after the matte its applies so only the first 2 and a half 
letters show up and then nothing... I had used key frames so that the 
word scrolls all the way across the screen with a variety of 
different video clips providing the video in the background... Are 
there any tutorials on how this might be achieved? I used Wrigley's 
tutorial to achieve this effect with static text, but can't seem to 
get it to work with the scrolling text you often see in the opening 
sequence of a film.. 

Any help would be appreciated! Thanks... 






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