Fix SourceRef race conditions, fix "source" and "target" getter returning unused instances, add missing validation, make "getDurationFromMetadata" only exist on tracks, fix examples, expand media player to support live playback, change the signatures of some Input APIs

src/hls/hls-demuxer.ts

@@ -593,12 +593,6 @@ export class HlsDemuxer extends Demuxer {
 		return segmentedInput;
 	}
 
-	async getDurationFromMetadata(options: DurationMetadataRequestOptions): Promise<number | null> {
-		return this.hasMasterPlaylist
-			? null
-			: this.segmentedInputs[0]!.getDurationFromMetadata(options);
-	}
-
 	async getMetadataTags(): Promise<MetadataTags> {
 		return {};
 	}