When true the footage is still; when false, it has a time-based component.Examples of still footage are JPEG files, solids, and placeholders with duration o


Creates a new null layer and adds the AVLayer object to this collection. This is the same as choosing Layer > New > Null object.duration Optional, the lengt


Creates and returns a new PlaceholderItem object and adds it to the projectメs items array. Same as the File > Import > Placeholder A string con


Creates a new AVLayer object containing the specified item, and adds it to this collection.The new layer honors the Create Layers at Composition Start Time


The number of frames to skip when rendering this item. Use this to do rendering tests that are faster than a full render.A value of 0 skip no frames, and re


Returns the duration, in seconds, of the item. Still footage items have a duration of 0.ユ In a CompItem, the value is linked to the duration of the composit


The duration in seconds of the composition to be rendered. The duration is determined by subtracting the start time from the end time. Setting this value is


Creates a PlaceholderSource object with specified values, sets this as the value of the proxySource attribute, and sets useProxy to true. It does not preser

AVItem object

The AVItem object provides access to attributes and methods of audio/visual files imported into After Effects.ユ AVItem is a subclass of Item. All methods an


The duration of a frame, in seconds. This is the inverse of the frameRate value frames-per-second .Floating-point; read/write.