QuickTime 3 Reference
| Previous | Chapter Contents | Chapter Top | Next |
You will probably need to do some track-level editing on the video tracks your effect will use as sources. This depends mainly on the type of effect you choose. There are different considerations for an effect that requires no sources, such as the cloud effect, an effect that requires one source, such as the blur filter, or an effect that requires two or more sources, such as a wipe effect.
Generally speaking, an effect uses an entire video track as a source. If you want to use part of a video track as a source for an effect, you need to create a new track that references the portions of source media that you want the effect to use. This is explained in more detail in the examples below.
| Previous | Chapter Contents | Chapter Top | Next |