Very interesting, Tomis. I will study what you did and see how it works!
Thanks!
Elvin
On Mar 27, 2006, at 3:07 PM, Tomis E. wrote:
You know I've been thinking about adding a "Color Screen" effect to
my open source program
ImagePlay < http://imageplay.sourceforge.net > . I added basic
support for movie layers in the
last version, you can run a bunch of effects (blur, invert,
contrast, etc) on the movie as it
plays. The source code could prove useful to you.
The process of converting the movie image into a REALbasic picture
object is very CPU intensive,
though rather easy to code. Essentially you just:
* open the movie as an editable movie
* make the height of the controller 16 or so pixels high so the
user can only see the control bar
* grab the image via EditableMovieObject.Picture, do your
processing, and then display it to the
user
As for the actual effect. You'll want to use the picture object's
RGBsurface object for the best
speed. You simply iterate over each pixel, determine if it's in the
color range you want, and set
the mask pixel accordingly. See the effect "Replace Color" in
ImagePlay for an idea of how fast
this will be.
During live playback I use a timer to grab the frames. If you want
to process the movie and export
it frame-for-frame though, that's a bit more complex. You'll have
to use a QTVideoTrack and
QTTrack.FindNextSample for the capture, and then have a second
editablemovie object that you write
out the processed frames to.
Feel free to email me off-list if you get stuck!
Thank you,
~ Tomis
--- " Elvin S. Rodríguez " <[EMAIL PROTECTED]> wrote:
I've seen discussion on alpha channels and picts, however, I'm trying
to write software that will allow me to work with video and a green
screen. I would like to juxtapose a graphic or another video as a
background to a live video (or another video file). Can someone give
me any ideas of how I could do this in RB? Is this even possible? I'm
willing to read, so if you have any references, I would appreciate
them.
Thanks in advance,
Elvin R.
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