get Thumbnail
Returns a Thumbnail for the provided playback time. Supported thumbnail formats are WebVtt
configured via SourceConfig.thumbnailTrack or HLS Image Media Playlist
in the master playlist. If a WebVtt
thumbnail track is provided, any potential Image Media Playlist
thumbnails are ignored. A thumbnail track will start loading once loadingState transitions to LoadingState.Loading.
This function returns null
if the thumbnails were not loaded yet
if there are no thumbnails available in the source
if there is no thumbnail available at the provided time
Limitations
There is currently no event in place that signals when thumbnails are loaded.