QuickTime Streaming

Track Header Atom (`'tkhd'` )

The flags field of the track header atom must be 0x000000, indicating the track is inactive, and not part of the movie, preview, or poster. Hint tracks must be marked as inactive for the movie to play locally.

The creation time, modification time, and track ID fields are set as they would be for any track.

The duration field is also the duration of the media track being hinted, expressed in movie time scale.

The layer field is not used.

The alternate group field can be used to distinguish alternate language or alternate data rate tracks in streaming movies. It is not required that all servers support this feature. It is not recommended that applications attempt to make use of this feature at this time. This field is normally set to 1.

The remaining track header fields are not used for hint tracks.

Unused fields should be set to 0 when creating hint tracks and ignored when using them.

Track Header Atom ( 'tkhd' )

Track Header Atom (`'tkhd'` )