guessAlphaMode()

Sets alphaMode, premulColor, and invertAlpha to the best estimates for this footage source. If hasAlpha is false, no change is made.None.Nothing.

replaceWithPlaceholder()

Changes the source of this FootageItem to the specified placeholder. Creates a new PlaceholderSource object, sets its values from the parameters, and sets m

addText()

Creates a new point text layer and adds the new TextLayer object to this collection.To create a paragraph box text layer, use the addBoxText method. For mor

replaceWithSolid()

Changes the source of this FootageItem to the specified solid. Creates a new SolidSource object, sets its values from theparameters, andsets mainSource to t