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Table of Contents
How do transitions work?
A transition is a gradual change from an edit to another.
The best way to understand how transitions work is to analyze the Dissolve video transition.
Here you see a 2 seconds long transition between a green edit and a pink edit.
The same, identical video transition can be obtained putting the edits on different tracks and gradually reducing the opacity of the upper one (fading it out).
It’s extremely important that you notice that the two video edits overlap for two seconds. It’s pretty obvious when you look at the second screenshot, but it is so (even if not visible) also in a one-track-only transition. In this case two seconds of the green edit are implied in the brown bar and not represented as video picon.
From this fact it comes an important rule for using transitions:
You need more footage than you imagine!
In our example the green edit preceding the one-track-only transition must have two spare seconds after the right edit boundary to "feed" the transition.
What happens if there are no spare frames?
Cinelerra will come to the rescue and will use the last frame of the first edit to "feed" the transition. Clever, isn’t she?
In case of a transition between two still picture you won’t have any problem. In case of a transition between two video edits your first edit will freeze during the transition, this being particularly noticeable (and ugly) with fast movement videos.
How to add a video transition
You can add transitions between video edits.
Video→ Default transition will add the last used transition to the edit boundary preceeding the insertion point (if you are lucky).
How to crossfade audio
Crossfade is the only audio transition available. You can find it in the Audio Transition tab of the Resources window.
Audio→ Default transition will add the Crossfade transition to the edit boundary preceeding the insertion point (probably).
How to modify the duration of a transition
You can’t drag the boundaries of a transition.
To modify the duration of a transition right click on the transition icon and select Length from the popup menu.
Cinelerra will memorize this measure and will keep it for the following transitions (unless you modify it again of course).
How to modify the behaviour of a transition
Most transition have different behaviours available.
How to delete a transition
Right click on the transition and select Detach from the popup menu.
How to add fancy 3D transitions
If you want to add fancy 3D transitions… well… you need proprietary software.
Cinelerra can’t do 3D transitions and I don’t know any Free Software that can (except Blender where you can make your 3D video yoursef).
Don’t despair, Grandma: the Shapewipe transition can probably be of some consolation.
How to make the Shape Wipe transition work at best
The default Shape Wipe transition will make the change from your first edit to the second one shaped like a heart.
To achieve that Cinelerra uses a gray-scale PNG image as reference.
If you right click on the transition icon on the timeline and select Show from the popup menu you can choose between 5 different shapes, that is between 5 different gray-scale PNG images. Click on Browse to view the list of available shapes.
Note that you are browsing images you have installed in the /usr/lib/cinelerra/shapewipe folder (if you installed a precompiled package) or in the /usr/local/lib/cinelerra/shapewipe folder (if you compiled Cinelerra yourself).
If you browse your filesystem outside Cinelerra you can actually watch those images.
If you installed a precompiled package:
If you compiled Cinelerra yourself:
You see? The functioning of the Shape Wipe transition is very simple.
 Fussy people would say that you can store your gray-scale PNG images in any place of your filesystem since Cinelerra will let you browse anywhere. While this si good in principle, it won’t make your work quicker.
How to add a chosen transition to all the pictures of a slideshow
(the quickest way)
The quickest way of adding the same video transition to all the pictures of your slideshow is to edit directly the EDL in a text editor. It looks scary but in fact it is pretty grandmable.
Let’s try with a Dissolve transition.
I assume you have already loaded all your pictures on the timeline and you have saved your project as myproject.xml.
<EDIT STARTSOURCE="0" CHANNEL="0" LENGTH="111"><FILE SRC="/home/raffa/MammaMia/Pizza01.jpg"></FILE> <TRANSITION TITLE="Dissolve" LENGTH="25"><ON></ON><KEYFRAME POSITION="0"></KEYFRAME> <KEYFRAME POSITION="0"></KEYFRAME> </TRANSITION> </EDIT>
<EDIT STARTSOURCE="0" CHANNEL="0" LENGTH="125"><FILE SRC="/home/raffa/MammaMia/Pizza02.jpg"></FILE></EDIT>
The transition description is inserted between </FILE> and </EDIT>.
and Replace it with:
<TRANSITION TITLE="Dissolve" LENGTH="25"><ON></ON><KEYFRAME POSITION="0"></KEYFRAME> <KEYFRAME POSITION="0"></KEYFRAME> </TRANSITION> </EDIT>