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When one edit ends and another edit begins, the default behavior is to have the first edit's output immediately become the output of the second edit when played back. Transitions are a way for the first edit is output to become the second edit is output with different variations.
Cinelerra supports audio and video transitions, all of which are listed in the resource window.
Video transitions in the resources window
Transitions may only apply to the matching track type. Transitions under audio transitions can only apply to audio tracks. Transitions under video transitions can only apply to video tracks.
Load a video file and cut a section from the center so the edit point is visible on the timeline. Go the resource window and click on the Video transitions folder. Drag a transition from the transition list onto the second video edit on the timeline. A box highlights over where the transition will appear. Releasing it over the second edit applies the transition between the first and second edit.
Dragging a dissolve transition to the timeline
You can now scrub(2) over the transition with the transport controls and watch the output in the Compositor window. Scrubbing with the insertion point does not normally show transitions because the transition durations are usually too short.
Once the transition is in place, it can be edited similarly to an effect. Move the pointer over the transition and right click to bring up the transition menu. The show option brings up specific parameters for the transition in question if there are any. The length option adjusts the length of the transition in seconds. Once these two parameters are set, they are applied to future transitions until they are changed again. Finally, the detach option removes the transition from the timeline.
Dragging and dropping transitions from the Resource window to the Program window can be really slow and tiring. Fortunately, once you drag a transition from the Resource window, the U and u keys will paste the same transition. The U key pastes the last video transition and the u key pastes the last audio transition on all the recordable tracks. If the insertion point or in point is over an edit, the beginning of the edit is covered by the transition.
It should be noted that when playing transitions from the timeline to hardware accelerated video device, the hardware acceleration will usually be turned off momentarily during the transition and on after the transition in order to render the transition. Using an un-accelerated video device for the entire timeline normally removes the disturbance.
Important: The exact point in time when the transition takes effect is not straightforward. It starts when the second edit begins and lasts a certain amount of time into the second edit. Therefore, the first asset needs to have enough data after the edit point to fill the transition into the second edit.
For example, the dissolve transition starts at the exact position where it is located on the timeline. If you set a duration of 1 second for a dissolve transition, it will not start 0.5 second before the transition and continue 0.5 second after that point. In fact, it will start exactly where the transition is located on the timeline, and last for 1 second from that position.
It is a common error to put a dissolve transition just after the last frame of an asset. Let's imagine a dissolve transition is put between asset A and asset B, just after the last frame of asset A.
Since the dissolve effect starts exactly at the position where it is located, there is no more frames from asset A to display when the dissolve transition starts. Therefore, there is no other choice for Cinelerra than freezing the last frame of asset A and dissolving it with asset B.
You have to make sure there is enough frames of asset A to be displayed when the dissolve transition starts. The duration of those frames should be equal or greater than the length of the transition effect.
This is a soft dissolve transition between two video segments, which we call in and out segments. The in segment turns increasingly transparent while the out segment materializes into its place. The length of time for the full effect to take place can be controlled by the "Transition Length" control.
Available controls:
By right-clicking on the transition icon in the timeline, a menu will pop-up
with the following controls
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This document was generated by Raffa on October, 7 2007 using texi2html 1.76.