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Blender
Help
This is a help screen for blue screen blending.
 What is Blue
Screen Blending?
The Blue Screen
Blender is the component used to combine two videos together. This
component can change the position, transparency and size of the blending.
The term Blue Screen is used because where ever the color blue appears in
the video it becomes clear.
What videos
are required for blending?
Unlike Extraction or
Freezing, the Blender uses result videos from the Extracter Engine.
The other video (video with student) can be any regular captured video.
Size and length do not need to match the Extracted video.
Where is the
Blender stored and how do you start it?
The Blender is
located in the Tools area of the Navigation Bar. You can also start the
Motion Blender from the Menu option File/Open/Video Blender.
To start this
component click on the "Motion Blender"
ICON.
What are the parts of the user interface?
When the Blender starts it displays an
interface with two empty video areas, a tool bar and video
offset configuration window.
When you drop a video in the student area (Left) the
orange offset bar will appear. The same is true for the model video
except this offset bar is blue. Directly above and below the offset bars are
video position controls, these appear as little arrows. These
arrows are connected to each other, moving one is the same as moving
both. These arrows control where in the video the two video
windows are displaying.
The video position controls are used to control the
offset between the two videos. The bars look like movie film, the idea is
that they look like two films on a table that need to offset to match the
motion that occurs in the film. Both can move, but normally you need only
need to move the video which is longer (typically the student). To move
the offset bar just click and drag the bar. You can use the arrows of the
keyboard once the bar is highlighted by a bright rectangle.
The bar with the Green
and Red dots indicate where the blending will start and end. Again you can
control the positions by clicking of the dot and dragging it to a
different location. If you click in the middle of the bar the
whole thing can be moved.
The tool bar at the top of the
Motion Blending window contains a number of buttons used to Start/Stop and
configure the blending parameters.
How to configure the blend?
1. Use the gallery component to find a student video.
When located drag and drop this video on to the left hand window panel, this
panel is called "Student Video".
2. Again use the gallery to find the blue (extracted) video, this is
the video produced by the extraction engine. When located drag and drop this
video on the right window panel, this panel is called "Extracted
Video".
3. Move the video position arrow to the ball impact point
in the model swing. Next move the offset bar of the student video
across so that the two videos are synchronized on ball impact.
Finally use the start and finish bar to mark the start and end points of the resulting
video. Again, as in the play control the top arrow is used to select the
position where the videos will be shown in the panels.
4. To adjust the position, transparency and size of the blending, click on
the tool bar button called "Blend Pos". This will activate the
screen shown below.
The slider bar controls the
transparency the arrow buttons control the position offsets. The plus (+) and
minus (-) buttons control the relative zooming factor. To close the window
clicks the OK button.
5. To start the blending process, close
the Blend Pos windows and then click on the tool bar button called
"Start" the Start/Finish bar in the timeline will indicate the
progress of the operation.
After complete two, more clips
can be processed.
How to configure the compression?
On the toolbar there is a button
called "Compress", this button is used to configure the type of video
compression to use when blending the videos.
The
video quality control on the left side of the window allows you to
configure a trade off between quality and size of the video. The results
will depend of the video engine selected. The drop down list on the left
side will display the complete list of video compression
engines on your computer.
Once
the compression type has been selected the setting will be saved and
restored the next time you use the blending engine. Note that some of the
compression engines in the list may not work as they require special video
formats.
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