Quicktime File Format (2012-08-14).pdf

Media Data Atom TypesClosed Captioning MediakRangeStartstrt // unsigned longkRangeEnd end // unsigned longChild atoms of the parent atom are the events of type kQTEventType and the ID of the event type. The childrenof these event atoms follow the same format as other wired events.kQTEventType, (kQTEventMouseClick, kQTEventMouseClickEnd,kQTEventMouseClickEndTriggerButton,kQTEventMouseEnter, kQTEventMouseExit)...kTextWiredObjectsAtomType, 1kHyperTextItemAtomType, 1..nkRangeStart, 1longkRangeEnd, 1longkAction// The known range of track movie sprite actionsClosed Captioning MediaA closed caption media track contains text data used for closed captioning in QuickTime movies. It has a mediatype of 'clcp'. Closed captions are used to display the audio portions of a movie as text. They transcribedialog and indicate other sounds.Other tracks can identify this track as being a related closed captioning track by using the 'clcp' trackreference to refer to this track.Closed Captioning Sample DescriptionThe closed captioning sample description contains information that defines how to interpret closed captioningmedia data. This sample description is based on the standard sample description header, as described in“Sample Description Atoms” (page 99), and adds no additional fields.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.198