Reads the cues of a media's text renditions into their tracks, for as long as the media is loaded.
Which tracks are read, and for how long, is the same wherever the renditions come from. How a
rendition's cue times reach the media timeline is not, so createFetcher is left to a subclass
per media type - along with whatever that type needs to answer it.
Reads the cues of a media's text renditions into their tracks, for as long as the media is loaded.
Which tracks are read, and for how long, is the same wherever the renditions come from. How a rendition's cue times reach the media timeline is not, so createFetcher is left to a subclass per media type - along with whatever that type needs to answer it.