Properly handle subrequests for redirected URLs

src/hls/hls-demuxer.ts

@@ -77,12 +77,15 @@ export class HlsDemuxer extends Demuxer {
 	readMetadata() {
 		return this.metadataPromise ??= (async () => {
 			assert(this.input._rootSource instanceof PathedSource);
-			const { rootPath } = this.input._rootSource;
 
 			const slice = await this.input._reader.requestEntireFile();
 			assert(slice);
 			const lines = readAllLines(slice, slice.length, { ignore: canIgnoreLine });
 
+			// Important: get the root path AFTER reading data to get the final root path, possibly affected by
+			// redirects. Any follow requests should be related to the redirected path, not the original one.
+			const { rootPath } = this.input._rootSource;
+
 			const variantStreams: {
 				fullPath: string;
 				attributes: AttributeList;