Fix DASH streams support.

CHANGELOG.md

@@ -1,6 +1,8 @@
 ## 1.10.7
 - Fix the error of incomplete data loading on the Android emulator.
 - Fix error when the http-client is closed and the request is still running.
+- Fix extraction for DASH streams.
+
 ## 1.10.6
 - Implement `Playlist.videoCount`.
 

example/example.dart

@@ -1,7 +1,6 @@
 // ignore_for_file: avoid_print
-import 'package:youtube_explode_dart/youtube_explode_dart.dart';
-
 import 'package:youtube_explode_dart/src/youtube_explode_base.dart';
+import 'package:youtube_explode_dart/youtube_explode_dart.dart';
 
 Future<void> main() async {
   var yt = YoutubeExplode();

lib/src/channels/channel_client.dart

@@ -1,12 +1,10 @@
-import 'package:youtube_explode_dart/src/channels/channel_uploads_list.dart';
-import 'package:youtube_explode_dart/src/reverse_engineering/pages/channel_page.dart';
-import 'package:youtube_explode_dart/src/reverse_engineering/pages/watch_page.dart';
-
 import '../common/common.dart';
 import '../extensions/helpers_extension.dart';
 import '../playlists/playlists.dart';
 import '../reverse_engineering/pages/channel_about_page.dart';
+import '../reverse_engineering/pages/channel_page.dart';
 import '../reverse_engineering/pages/channel_upload_page.dart';
+import '../reverse_engineering/pages/watch_page.dart';
 import '../reverse_engineering/youtube_http_client.dart';
 import '../videos/video.dart';
 import '../videos/video_id.dart';

lib/src/channels/channel_uploads_list.dart

@@ -1,10 +1,10 @@
 import 'dart:async';
 
 import 'package:collection/collection.dart';
-import 'package:youtube_explode_dart/src/reverse_engineering/pages/channel_upload_page.dart';
 
 import '../../youtube_explode_dart.dart';
 import '../extensions/helpers_extension.dart';
+import '../reverse_engineering/pages/channel_upload_page.dart';
 
 /// This list contains a channel uploads.
 /// This behaves like a [List] but has the [SearchList.nextPage] to get the next batch of videos.

lib/src/extensions/helpers_extension.dart

@@ -1,6 +1,7 @@
 library _youtube_explode.extensions;
 
 import 'dart:convert';
+
 import 'package:collection/collection.dart';
 
 import '../reverse_engineering/cipher/cipher_operations.dart';
@@ -288,3 +289,37 @@ extension GenericExtract on List<String> {
     throw orThrow();
   }
 }
+
+/// Iterable that joins together multiple lists
+class JoinedIterable<T> extends Iterable<T> {
+  final Iterable<Iterable<T>> _iterables;
+
+  JoinedIterable(this._iterables);
+
+  @override
+  Iterator<T> get iterator {
+    return _JoinedIterator<T>(_iterables.map((e) => e.iterator).toList());
+  }
+}
+
+class _JoinedIterator<T> extends Iterator<T> {
+  final Iterable<Iterator<T>> _iterators;
+  var _currentIter = 0;
+
+  _JoinedIterator(this._iterators);
+
+  @override
+  bool moveNext([int debug = 0]) {
+    if (!_iterators.elementAt(_currentIter).moveNext()) {
+      if (_currentIter == _iterators.length - 1) {
+        return false;
+      }
+      _currentIter++;
+      return moveNext(debug + 1);
+    }
+    return true;
+  }
+
+  @override
+  T get current => _iterators.elementAt(_currentIter).current;
+}

lib/src/playlists/playlist_client.dart

@@ -1,7 +1,6 @@
-import 'package:youtube_explode_dart/src/channels/channel_id.dart';
-import 'package:youtube_explode_dart/src/reverse_engineering/pages/playlist_page.dart';
-
+import '../channels/channel_id.dart';
 import '../common/common.dart';
+import '../reverse_engineering/pages/playlist_page.dart';
 import '../reverse_engineering/youtube_http_client.dart';
 import '../videos/video.dart';
 import '../videos/video_id.dart';

lib/src/retry.dart

@@ -9,7 +9,8 @@ import 'exceptions/exceptions.dart';
 
 /// Run the [function] each time an exception is thrown until the retryCount
 /// is 0.
-Future<T> retry<T>(YoutubeHttpClient? client, FutureOr<T> Function() function) async {
+Future<T> retry<T>(
+    YoutubeHttpClient? client, FutureOr<T> Function() function) async {
   var retryCount = 5;
 
   // ignore: literal_only_boolean_expressions

lib/src/reverse_engineering/clients/comments_client.dart

@@ -1,9 +1,9 @@
 import 'package:collection/collection.dart';
-import 'package:youtube_explode_dart/src/reverse_engineering/pages/watch_page.dart';
 
 import '../../../youtube_explode_dart.dart';
 import '../../extensions/helpers_extension.dart';
 import '../../retry.dart';
+import '../pages/watch_page.dart';
 import '../youtube_http_client.dart';
 
 class CommentsClient {
@@ -22,8 +22,8 @@ class CommentsClient {
   static Future<CommentsClient?> get(
       YoutubeHttpClient httpClient, Video video) async {
     final watchPage = video.watchPage ??
-        await retry<WatchPage>(httpClient,
-            () async => WatchPage.get(httpClient, video.id.value));
+        await retry<WatchPage>(
+            httpClient, () async => WatchPage.get(httpClient, video.id.value));
 
     final continuation = watchPage.commentsContinuation;
     if (continuation == null) {

lib/src/reverse_engineering/clients/embedded_player_client.dart

@@ -83,53 +83,84 @@ class EmbeddedPlayerClient {
 }
 
 class _StreamInfo extends StreamInfoProvider {
+  static final _contentLenExp = RegExp(r'[\?&]clen=(\d+)');
+
+  /// Json parsed map
   final JsonMap root;
 
   @override
-  late final int tag = root['itag']!;
+  late final int? bitrate = root.getT<int>('bitrate');
 
   @override
-  late final String url = root['url']!;
+  late final String? container = mimeType?.subtype;
 
   @override
-  late final int? contentLength = int.tryParse(root['contentLength'] ??
-      StreamInfoProvider.contentLenExp.firstMatch(url)?.group(1) ??
-      '');
+  late final int? contentLength = int.tryParse(
+      root.getT<String>('contentLength') ??
+          _contentLenExp.firstMatch(url)?.group(1) ??
+          '');
 
   @override
-  late final int bitrate = root['bitrate']!;
-
-  late final MediaType mimeType = MediaType.parse(root['mimeType']!);
+  late final int? framerate = root.getT<int>('fps');
 
   @override
-  late final String container = mimeType.subtype;
-
-  late final List<String> codecs = mimeType.parameters['codecs']!
-      .split(',')
-      .map((e) => e.trim())
-      .toList()
-      .cast<String>();
+  late final String? signature =
+      Uri.splitQueryString(root.getT<String>('signatureCipher') ?? '')['s'];
 
   @override
-  late final String audioCodec = codecs.last;
+  late final String? signatureParameter = Uri.splitQueryString(
+          root.getT<String>('cipher') ?? '')['sp'] ??
+      Uri.splitQueryString(root.getT<String>('signatureCipher') ?? '')['sp'];
 
   @override
-  late final String? videoCodec = isAudioOnly ? null : codecs.first;
-
-  late final bool isAudioOnly = mimeType.type == 'audio';
+  late final int tag = root.getT<int>('itag')!;
 
   @override
-  late final String videoQualityLabel =
-      root['qualityLabel'] ?? root['quality_label'];
+  late final String url = root.getT<String>('url') ??
+      Uri.splitQueryString(root.getT<String>('cipher') ?? '')['url'] ??
+      Uri.splitQueryString(root.getT<String>('signatureCipher') ?? '')['url']!;
 
   @override
-  late final int? videoWidth = root['width'];
+  late final String? videoCodec = isAudioOnly
+      ? null
+      : codecs?.split(',').firstOrNull?.trim().nullIfWhitespace;
 
   @override
-  late final int? videoHeight = root['height'];
+  late final int? videoHeight = root.getT<int>('height');
 
   @override
-  late final int? framerate = root['fps'] ?? 0;
+  late final String? videoQualityLabel = root.getT<String>('qualityLabel');
+
+  @override
+  late final int? videoWidth = root.getT<int>('width');
+
+  late final bool isAudioOnly = mimeType?.type == 'audio';
+
+  late final MediaType? mimeType = _getMimeType();
+
+  MediaType? _getMimeType() {
+    var mime = root.getT<String>('mimeType');
+    if (mime == null) {
+      return null;
+    }
+    return MediaType.parse(mime);
+  }
+
+  late final String? codecs = mimeType?.parameters['codecs']?.toLowerCase();
+
+  @override
+  late final String? audioCodec =
+      isAudioOnly ? codecs : _getAudioCodec(codecs?.split(','))?.trim();
+
+  String? _getAudioCodec(List<String>? codecs) {
+    if (codecs == null) {
+      return null;
+    }
+    if (codecs.length == 1) {
+      return null;
+    }
+    return codecs.last;
+  }
 
   @override
   final StreamSource source;

lib/src/reverse_engineering/dash_manifest.dart

@@ -1,6 +1,10 @@
+import 'package:collection/collection.dart';
+import 'package:http_parser/http_parser.dart';
 import 'package:xml/xml.dart' as xml;
 
+import '../extensions/helpers_extension.dart';
 import '../retry.dart';
+import 'models/fragment.dart';
 import 'models/stream_info_provider.dart';
 import 'youtube_http_client.dart';
 
@@ -11,14 +15,7 @@ class DashManifest {
   final xml.XmlDocument _root;
 
   ///
-  late final Iterable<_StreamInfo> streams = _root
-      .findElements('Representation')
-      .where((e) => e
-          .findElements('Initialization')
-          .first
-          .getAttribute('sourceURL')!
-          .contains('sq/'))
-      .map((e) => _StreamInfo(e));
+  late final Iterable<_StreamInfo> streams = parseMDP(_root);
 
   ///
   DashManifest(this._root);
@@ -38,59 +35,238 @@ class DashManifest {
   ///
   static String? getSignatureFromUrl(String url) =>
       _urlSignatureExp.firstMatch(url)?.group(1);
+
+  bool _isDrmProtected(xml.XmlElement element) =>
+      element.findElements('ContentProtection').isNotEmpty;
+
+  _SegmentTimeline? extractSegmentTimeline(xml.XmlElement source) {
+    final segmentTimeline = source.getElement('SegmentTimeline');
+    if (segmentTimeline != null) {
+      return _SegmentTimeline(segmentTimeline.findAllElements('S').map((e) {
+        final d = int.tryParse(e.getAttribute('d') ?? '0')!;
+        final r = int.tryParse(e.getAttribute('r') ?? '0')!;
+        return _S(d, r);
+      }).toList());
+    }
+    return null;
+  }
+
+  _MsInfo extractMultiSegmentInfo(
+      xml.XmlElement element, _MsInfo msParentInfo) {
+    final msInfo = msParentInfo.copy(); // Copy
+
+    final segmentList = element.getElement('SegmentList');
+    if (segmentList != null) {
+      msInfo.segmentTimeline =
+          extractSegmentTimeline(segmentList) ?? msParentInfo.segmentTimeline;
+      msInfo.initializationUrl =
+          segmentList.getElement('Initialization')?.getAttribute('sourceURL');
+
+      final segmentUrlsSE = segmentList.findAllElements('SegmentURL');
+      if (segmentUrlsSE.isNotEmpty) {
+        msInfo.segmentUrls = [
+          for (final segment in segmentUrlsSE) segment.getAttribute('media')!
+        ];
+      }
+    } else {
+      final segmentTemplate = element.getElement('SegmentTemplate');
+      if (segmentTemplate != null) {
+        // Note: Currently SegmentTemplates are not supported.
+/*        final segmentTimeLine = extractSegmentTimeline(segmentTemplate);
+        if (segmentTimeLine != null) {
+          msInfo['s'] = segmentTimeLine;
+        }
+
+        final timeScale = segmentTemplate.getAttribute('timescale');
+        if (timeScale != null) {
+          msInfo['timescale'] = int.parse(timeScale);
+        }
+
+        final media = segmentTemplate.getAttribute('media');
+        if (media != null) {
+          msInfo['media'] = media;
+        }
+        final initialization = segmentTemplate.getAttribute('initialization');
+        if (initialization != null) {
+          msInfo['initialization'] = initialization;
+        } else {
+          extractInitialization(segmentTemplate);
+        }*/
+      }
+    }
+    return msInfo;
+  }
+
+  List<_StreamInfo> parseMDP(xml.XmlDocument root) {
+    if (root.getAttribute('type') == 'dynamic') {
+      return const [];
+    }
+
+    final formats = <_StreamInfo>[];
+    final periods = root.findAllElements('Period');
+    for (final period in periods) {
+      final periodMsInfo = extractMultiSegmentInfo(period, _MsInfo());
+      final adaptionSets = period.findAllElements('AdaptationSet');
+      for (final adaptionSet in adaptionSets) {
+        if (_isDrmProtected(adaptionSet)) {
+          continue;
+        }
+        final adaptionSetMsInfo =
+            extractMultiSegmentInfo(adaptionSet, periodMsInfo);
+        for (final representation
+            in adaptionSet.findAllElements('Representation')) {
+          if (_isDrmProtected(representation)) {
+            continue;
+          }
+          final representationAttrib = {
+            for (var e in adaptionSet.attributes) e.name.local: e.value,
+            for (var e in representation.attributes) e.name.local: e.value,
+          };
+
+          final mimeType = MediaType.parse(representationAttrib['mimeType']!);
+
+          if (mimeType.type == 'video' || mimeType.type == 'audio') {
+            // Extract the base url
+            var baseUrl = JoinedIterable<xml.XmlElement>([
+              representation.childElements,
+              adaptionSet.childElements,
+              period.childElements,
+              root.childElements
+            ])
+                .firstWhereOrNull((e) {
+                  final baseUrlE = e.getElement('BaseURL')?.text.trim();
+                  if (baseUrlE == null) {
+                    return false;
+                  }
+                  return baseUrlE.contains(RegExp('^https?://'));
+                })
+                ?.text
+                .trim();
+
+            if (baseUrl == null || !baseUrl.startsWith('http')) {
+              throw UnimplementedError(
+                  'This kind of DASH Stream is not yet implemented. '
+                  'Please open a new issue on this project GitHub.');
+            }
+
+            final representationMsInfo =
+                extractMultiSegmentInfo(representation, adaptionSetMsInfo);
+
+            if (representationMsInfo.segmentUrls != null &&
+                representationMsInfo.segmentTimeline != null) {
+              final fragments = <Fragment>[];
+              var segmentIndex = 0;
+              for (final s in representationMsInfo.segmentTimeline!.segments) {
+                for (var i = 0; i < (s.r + 1); i++) {
+                  final segmentUri =
+                      representationMsInfo.segmentUrls![segmentIndex];
+                  if (segmentUri.contains(RegExp('^https?://'))) {
+                    throw UnimplementedError(
+                        'This kind of DASH Stream is not yet implemented. '
+                        'Please open a new issue on this project GitHub.');
+                  }
+                  fragments.add(Fragment(segmentUri));
+                  segmentIndex++;
+                }
+              }
+              representationMsInfo.fragments = fragments;
+            }
+
+            final fragments = <Fragment>[
+              if (representationMsInfo.fragments != null &&
+                  representationMsInfo.initializationUrl != null)
+                Fragment(representationMsInfo.initializationUrl!),
+              ...?representationMsInfo.fragments
+            ];
+
+            formats.add(_StreamInfo(
+                int.parse(representationAttrib['id']!),
+                baseUrl,
+                mimeType,
+                int.tryParse(representationAttrib['width'] ?? ''),
+                int.tryParse(representationAttrib['height'] ?? ''),
+                int.tryParse(representationAttrib['frameRate'] ?? ''),
+                fragments));
+          }
+        }
+      }
+    }
+
+    return formats;
+  }
 }
 
 class _StreamInfo extends StreamInfoProvider {
-  static final _contentLenExp = RegExp(r'[/\?]clen[/=](\d+)');
+  @override
+  final int tag;
 
-  final xml.XmlElement root;
+  @override
+  final String url;
 
-  _StreamInfo(this.root);
+  @override
+  String get container => _mimetype.subtype;
+
+  final MediaType _mimetype;
+
+  bool get isAudioOnly => _mimetype.type == 'audio';
+
+  @override
+  String? get audioCodec => isAudioOnly ? _mimetype.subtype : null;
+
+  @override
+  String? get videoCodec => isAudioOnly ? null : _mimetype.subtype;
+
+  @override
+  final int? videoWidth;
+
+  @override
+  final int? videoHeight;
+
+  @override
+  final int? framerate;
+
+  @override
+  final List<Fragment> fragments;
 
   @override
   StreamSource get source => StreamSource.dash;
 
-  @override
-  late final int tag = int.parse(root.getAttribute('id')!);
-
-  @override
-  late final String url = root.getAttribute('BaseURL')!;
-
-  @override
-  late final int contentLength = int.parse(
-      (root.getAttribute('contentLength') ??
-          _contentLenExp.firstMatch(url)?.group(1))!);
-
-  @override
-  late final int bitrate = int.parse(root.getAttribute('bandwidth')!);
-
-  @override
-  late final String? container = '';
-
-  /*
-      Uri.decodeFull((_containerExp.firstMatch(url)?.group(1))!);*/
-
-  late final bool isAudioOnly =
-      root.findElements('AudioChannelConfiguration').isNotEmpty;
-
-  @override
-  late final String? audioCodec =
-      isAudioOnly ? null : root.getAttribute('codecs');
-
-  @override
-  late final String? videoCodec =
-      isAudioOnly ? root.getAttribute('codecs') : null;
-
-  @override
-  late final int videoWidth = int.parse(root.getAttribute('width')!);
-
-  @override
-  late final int videoHeight = int.parse(root.getAttribute('height')!);
-
-  @override
-  late final int framerate = int.parse(root.getAttribute('framerate')!);
-
-  // TODO: Implement this
-  @override
-  late final String? videoQualityLabel = null;
+  _StreamInfo(this.tag, this.url, this._mimetype, this.videoWidth,
+      this.videoHeight, this.framerate, this.fragments);
+}
+
+class _SegmentTimeline {
+  final List<_S> segments;
+
+  const _SegmentTimeline(this.segments);
+}
+
+class _S {
+  final int d;
+  final int r;
+
+  const _S(this.d, this.r);
+}
+
+class _MsInfo {
+  int startNumber = 1;
+
+  String? initializationUrl;
+  _SegmentTimeline? segmentTimeline;
+  List<String>? segmentUrls;
+  List<Fragment>? fragments;
+
+  _MsInfo();
+
+  _MsInfo copy() {
+    final v = _MsInfo();
+
+    v.initializationUrl = initializationUrl;
+    v.segmentTimeline = segmentTimeline;
+    v.segmentUrls = segmentUrls;
+    v.fragments = fragments;
+    v.startNumber = startNumber;
+
+    return v;
+  }
 }

lib/src/reverse_engineering/heuristics.dart

@@ -70,8 +70,7 @@ extension VideoQualityUtil on VideoQuality {
       return VideoQuality.high4320;
     }
 
-    throw ArgumentError.value(
-        label, 'label', 'Unrecognized video quality label');
+    return VideoQuality.unknown;
   }
 
   ///

lib/src/reverse_engineering/models/fragment.dart

@@ -0,0 +1,6 @@
+/// Fragment used for DASH Manifests.
+class Fragment {
+  final String path;
+
+  const Fragment(this.path);
+}

lib/src/reverse_engineering/models/stream_info_provider.dart

@@ -1,3 +1,5 @@
+import 'fragment.dart';
+
 enum StreamSource { muxed, adaptive, dash }
 
 ///
@@ -24,7 +26,7 @@ abstract class StreamInfoProvider {
   int? get contentLength => null;
 
   ///
-  int? get bitrate;
+  int? get bitrate => null;
 
   ///
   String? get container;
@@ -36,7 +38,7 @@ abstract class StreamInfoProvider {
   String? get videoCodec => null;
 
   ///
-  String? get videoQualityLabel;
+  String? get videoQualityLabel => null;
 
   ///
   int? get videoWidth => null;
@@ -46,4 +48,7 @@ abstract class StreamInfoProvider {
 
   ///
   int? get framerate => null;
+
+  ///
+  List<Fragment>? get fragments => null;
 }

lib/src/reverse_engineering/pages/channel_about_page.dart

@@ -1,11 +1,11 @@
 import 'package:collection/collection.dart';
 import 'package:html/parser.dart' as parser;
-import 'package:youtube_explode_dart/src/reverse_engineering/models/youtube_page.dart';
 
 import '../../../youtube_explode_dart.dart';
 import '../../extensions/helpers_extension.dart';
 import '../../retry.dart';
 import '../models/initial_data.dart';
+import '../models/youtube_page.dart';
 import '../youtube_http_client.dart';
 
 ///

lib/src/reverse_engineering/pages/search_page.dart

@@ -1,16 +1,16 @@
 import 'package:collection/collection.dart';
 import 'package:html/parser.dart' as parser;
-import 'package:youtube_explode_dart/src/reverse_engineering/models/youtube_page.dart';
-import 'package:youtube_explode_dart/src/search/search_channel.dart';
 
 import '../../../youtube_explode_dart.dart';
 import '../../extensions/helpers_extension.dart';
 import '../../retry.dart';
 import '../../search/base_search_content.dart';
+import '../../search/search_channel.dart';
 import '../../search/search_filter.dart';
 import '../../search/search_video.dart';
 import '../../videos/videos.dart';
 import '../models/initial_data.dart';
+import '../models/youtube_page.dart';
 import '../youtube_http_client.dart';
 
 ///

lib/src/reverse_engineering/player/player_response.dart

@@ -96,7 +96,8 @@ class PlayerResponse {
   late final List<StreamInfoProvider> muxedStreams = root
           .get('streamingData')
           ?.getList('formats')
-          ?.map((e) => _StreamInfo(e, StreamSource.muxed))
+          ?.where((e) => e['url'] != null)
+          .map((e) => _StreamInfo(e, StreamSource.muxed))
           .cast<StreamInfoProvider>()
           .toList() ??
       const <StreamInfoProvider>[];

lib/src/reverse_engineering/youtube_http_client.dart

@@ -14,6 +14,7 @@ class YoutubeHttpClient extends http.BaseClient {
 
   // Flag to interrupt receiving stream.
   bool _closed = false;
+
   bool get closed => _closed;
 
   static const Map<String, String> _defaultHeaders = {
@@ -124,17 +125,54 @@ class YoutubeHttpClient extends http.BaseClient {
   }
 
   Stream<List<int>> getStream(StreamInfo streamInfo,
+      {Map<String, String> headers = const {},
+      bool validate = true,
+      int start = 0,
+      int errorCount = 0}) {
+    if (streamInfo.fragments.isNotEmpty) {
+      // DASH(fragmented) stream
+      return _getFragmentedStream(streamInfo,
+          headers: headers,
+          validate: validate,
+          start: start,
+          errorCount: errorCount);
+    }
+    // Normal stream
+    return _getStream(streamInfo,
+        headers: headers,
+        validate: validate,
+        start: start,
+        errorCount: errorCount);
+  }
+
+  Stream<List<int>> _getFragmentedStream(StreamInfo streamInfo,
       {Map<String, String> headers = const {},
       bool validate = true,
       int start = 0,
       int errorCount = 0}) async* {
-    var url = streamInfo.url;
+    // This is the base url.
+    final url = streamInfo.url;
+    for (final fragment in streamInfo.fragments) {
+      final req = await retry(
+          this, () => get(Uri.parse(url.toString() + fragment.path)));
+      yield req.bodyBytes;
+    }
+  }
+
+  Stream<List<int>> _getStream(StreamInfo streamInfo,
+      {Map<String, String> headers = const {},
+      bool validate = true,
+      int start = 0,
+      int errorCount = 0}) async* {
+    final url = streamInfo.url;
     var bytesCount = start;
+
     while (!_closed && bytesCount != streamInfo.size.totalBytes) {
       try {
         final response = await retry(this, () {
           final request = http.Request('get', url);
-          request.headers['range'] = 'bytes=$bytesCount-${bytesCount + 9898989 - 1}';
+          request.headers['range'] =
+              'bytes=$bytesCount-${bytesCount + 9898989 - 1}';
           return send(request);
         });
         if (validate) {
@@ -154,7 +192,7 @@ class YoutubeHttpClient extends http.BaseClient {
           rethrow;
         }
         await Future.delayed(const Duration(milliseconds: 500));
-        yield* getStream(streamInfo,
+        yield* _getStream(streamInfo,
             headers: headers,
             validate: validate,
             start: bytesCount,
@@ -218,8 +256,8 @@ class YoutubeHttpClient extends http.BaseClient {
         request.headers[key] = _defaultHeaders[key]!;
       }
     });
-    // print('Request: $request');
-    // print('Stack:\n${StackTrace.current}');
+    print('Request: $request');
+    print('Stack:\n${StackTrace.current}');
     return _httpClient.send(request);
   }
 }

lib/src/search/search_client.dart

@@ -58,8 +58,10 @@ class SearchClient {
     // ignore: literal_only_boolean_expressions
     for (;;) {
       if (page == null) {
-        page = await retry(_httpClient, () async =>
-            SearchPage.get(_httpClient, searchQuery, filter: filter));
+        page = await retry(
+            _httpClient,
+            () async =>
+                SearchPage.get(_httpClient, searchQuery, filter: filter));
       } else {
         page = await page.nextPage(_httpClient);
         if (page == null) {

lib/src/search/search_list.dart

@@ -1,10 +1,10 @@
 import 'dart:async';
 
 import 'package:collection/collection.dart';
-import 'package:youtube_explode_dart/src/reverse_engineering/pages/search_page.dart';
 
 import '../../youtube_explode_dart.dart';
 import '../extensions/helpers_extension.dart';
+import '../reverse_engineering/pages/search_page.dart';
 
 /// This list contains search videos.
 ///This behaves like a [List] but has the [SearchList.nextPage] to get the next batch of videos.

lib/src/videos/closed_captions/closed_caption_client.dart

@@ -1,8 +1,7 @@
-import 'package:youtube_explode_dart/src/reverse_engineering/pages/watch_page.dart';
-
 import '../../extensions/helpers_extension.dart';
 import '../../reverse_engineering/clients/closed_caption_client.dart' as re
     show ClosedCaptionClient;
+import '../../reverse_engineering/pages/watch_page.dart';
 import '../../reverse_engineering/youtube_http_client.dart';
 import '../videos.dart';
 import 'closed_caption.dart';

lib/src/videos/streams/audio_only_stream_info.dart

@@ -1,28 +1,17 @@
+import '../../reverse_engineering/models/fragment.dart';
 import 'streams.dart';
 
 /// YouTube media stream that only contains audio.
-class AudioOnlyStreamInfo implements AudioStreamInfo {
-  @override
-  final int tag;
-
-  @override
-  final Uri url;
-
-  @override
-  final StreamContainer container;
-
-  @override
-  final FileSize size;
-
-  @override
-  final Bitrate bitrate;
-
-  @override
-  final String audioCodec;
-
-  /// Initializes an instance of [AudioOnlyStreamInfo]
-  AudioOnlyStreamInfo(this.tag, this.url, this.container, this.size,
-      this.bitrate, this.audioCodec);
+class AudioOnlyStreamInfo extends AudioStreamInfo {
+  AudioOnlyStreamInfo(
+      int tag,
+      Uri url,
+      StreamContainer container,
+      FileSize size,
+      Bitrate bitrate,
+      String audioCodec,
+      List<Fragment> fragments)
+      : super(tag, url, container, size, bitrate, audioCodec, fragments);
 
   @override
   String toString() => 'Audio-only ($tag | $container)';

lib/src/videos/streams/audio_stream_info.dart

@@ -1,3 +1,4 @@
+import '../../reverse_engineering/models/fragment.dart';
 import 'streams.dart';
 
 /// YouTube media stream that contains audio.
@@ -7,6 +8,6 @@ abstract class AudioStreamInfo extends StreamInfo {
 
   ///
   AudioStreamInfo(int tag, Uri url, StreamContainer container, FileSize size,
-      Bitrate bitrate, this.audioCodec)
-      : super(tag, url, container, size, bitrate);
+      Bitrate bitrate, this.audioCodec, List<Fragment> fragments)
+      : super(tag, url, container, size, bitrate, fragments);
 }

lib/src/videos/streams/bitrate.dart

@@ -23,6 +23,8 @@ class Bitrate with Comparable<Bitrate>, _$Bitrate {
 
   const Bitrate._();
 
+  static const Bitrate unknown = Bitrate(0);
+
   @override
   int compareTo(Bitrate other) => bitsPerSecond.compareTo(other.bitsPerSecond);
 

lib/src/videos/streams/filesize.dart

@@ -23,6 +23,8 @@ class FileSize with Comparable<FileSize>, _$FileSize {
 
   const FileSize._();
 
+  static const FileSize unknown = FileSize(0);
+
   @override
   int compareTo(FileSize other) => totalBytes.compareTo(other.totalBytes);
 

lib/src/videos/streams/muxed_stream_info.dart

@@ -1,3 +1,4 @@
+import '../../reverse_engineering/models/fragment.dart';
 import 'audio_stream_info.dart';
 import 'bitrate.dart';
 import 'filesize.dart';
@@ -46,6 +47,10 @@ class MuxedStreamInfo implements AudioStreamInfo, VideoStreamInfo {
   @override
   final Framerate framerate;
 
+  /// Muxed streams never have fragments.
+  @override
+  List<Fragment> get fragments => const [];
+
   /// Initializes an instance of [MuxedStreamInfo]
   MuxedStreamInfo(
       this.tag,

lib/src/videos/streams/stream_info.dart

@@ -1,3 +1,4 @@
+import '../../reverse_engineering/models/fragment.dart';
 import 'bitrate.dart';
 import 'filesize.dart';
 import 'stream_container.dart';
@@ -20,8 +21,12 @@ abstract class StreamInfo {
   /// Stream bitrate.
   final Bitrate bitrate;
 
+  /// DASH streams contain multiple stream fragments.
+  final List<Fragment> fragments;
+
   /// Initialize an instance of [StreamInfo].
-  StreamInfo(this.tag, this.url, this.container, this.size, this.bitrate);
+  StreamInfo(this.tag, this.url, this.container, this.size, this.bitrate,
+      this.fragments);
 }
 
 /// Extension for Iterables of StreamInfo.

lib/src/videos/streams/streams_client.dart

@@ -151,15 +151,20 @@ class StreamsClient {
         url = url.setQueryParam(signatureParameter, signature);
       }
 
-      // Content length
-      var contentLength = streamInfo.contentLength ??
-          await _httpClient.getContentLength(url, validate: false) ??
-          0;
+      // Content length - Dont try to get content length of a dash stream.
+      var contentLength = streamInfo.source == StreamSource.dash
+          ? 0
+          : streamInfo.contentLength ??
+              await _httpClient.getContentLength(url, validate: false) ??
+              0;
 
+      if (contentLength == 0 && streamInfo.source != StreamSource.dash) {
+        continue;
+      }
       // Common
       var container = StreamContainer.parse(streamInfo.container!);
       var fileSize = FileSize(contentLength);
-      var bitrate = Bitrate(streamInfo.bitrate!);
+      var bitrate = Bitrate(streamInfo.bitrate ?? 0);
 
       var audioCodec = streamInfo.audioCodec;
       var videoCodec = streamInfo.videoCodec;
@@ -167,7 +172,7 @@ class StreamsClient {
       // Muxed or Video-only
       if (!videoCodec.isNullOrWhiteSpace) {
         var framerate = Framerate(streamInfo.framerate ?? 24);
-        var videoQualityLabel = streamInfo.videoQualityLabel!;
+        var videoQualityLabel = streamInfo.videoQualityLabel ?? '';
 
         var videoQuality = VideoQualityUtil.fromLabel(videoQualityLabel);
 
@@ -206,13 +211,14 @@ class StreamsClient {
             videoQualityLabel,
             videoQuality,
             videoResolution,
-            framerate);
+            framerate,
+            streamInfo.fragments ?? const []);
         continue;
       }
       // Audio-only
       if (!audioCodec.isNullOrWhiteSpace) {
-        streams[tag] = AudioOnlyStreamInfo(
-            tag, url, container, fileSize, bitrate, audioCodec!);
+        streams[tag] = AudioOnlyStreamInfo(tag, url, container, fileSize,
+            bitrate, audioCodec!, streamInfo.fragments ?? const []);
       }
 
       // #if DEBUG
@@ -228,13 +234,13 @@ class StreamsClient {
     videoId = VideoId.fromString(videoId);
 
     try {
-      final context = await _getStreamContextFromEmbeddedClient(videoId);
+      final context = await _getStreamContextFromWatchPage(videoId);
       return _getManifest(context);
     } on YoutubeExplodeException {
       //TODO: ignore
     }
 
-    final context = await _getStreamContextFromWatchPage(videoId);
+    final context = await _getStreamContextFromEmbeddedClient(videoId);
     return _getManifest(context);
   }
 

lib/src/videos/streams/video_only_stream_info.dart

@@ -1,3 +1,4 @@
+import '../../reverse_engineering/models/fragment.dart';
 import 'bitrate.dart';
 import 'filesize.dart';
 import 'framerate.dart';
@@ -7,50 +8,22 @@ import 'video_resolution.dart';
 import 'video_stream_info.dart';
 
 /// YouTube media stream that only contains video.
-class VideoOnlyStreamInfo implements VideoStreamInfo {
-  @override
-  final int tag;
-
-  @override
-  final Uri url;
-
-  @override
-  final StreamContainer container;
-
-  @override
-  final FileSize size;
-
-  @override
-  final Bitrate bitrate;
-
-  @override
-  final String videoCodec;
-
-  @override
-  final String videoQualityLabel;
-
-  @override
-  final VideoQuality videoQuality;
-
-  @override
-  final VideoResolution videoResolution;
-
-  @override
-  final Framerate framerate;
-
-  /// Initializes an instance of [VideoOnlyStreamInfo]
+class VideoOnlyStreamInfo extends VideoStreamInfo {
   VideoOnlyStreamInfo(
-      this.tag,
-      this.url,
-      this.container,
-      this.size,
-      this.bitrate,
-      this.videoCodec,
-      this.videoQualityLabel,
-      this.videoQuality,
-      this.videoResolution,
-      this.framerate);
+      int tag,
+      Uri url,
+      StreamContainer container,
+      FileSize size,
+      Bitrate bitrate,
+      String videoCodec,
+      String videoQualityLabel,
+      VideoQuality videoQuality,
+      VideoResolution videoResolution,
+      Framerate framerate,
+      List<Fragment> fragments)
+      : super(tag, url, container, size, bitrate, videoCodec, videoQualityLabel,
+            videoQuality, videoResolution, framerate, fragments);
 
   @override
-  String toString() => 'Video-only ($tag | $videoQualityLabel | $container)';
+  String toString() => 'Video-only ($tag | $videoResolution | $container)';
 }

lib/src/videos/streams/video_quality.dart

@@ -1,7 +1,7 @@
 /// Video quality.
 enum VideoQuality {
   /// Unknown video quality.
-  /// (This should be reported to the project's repo.)
+  /// (This should be reported to the project's repo if this is *NOT* a DASH Stream .)
   unknown,
 
   /// Low quality (144p).

lib/src/videos/streams/video_stream_info.dart

@@ -1,3 +1,4 @@
+import '../../reverse_engineering/models/fragment.dart';
 import 'streams.dart';
 
 /// YouTube media stream that contains video.
@@ -28,8 +29,9 @@ abstract class VideoStreamInfo extends StreamInfo {
       this.videoQualityLabel,
       this.videoQuality,
       this.videoResolution,
-      this.framerate)
-      : super(tag, url, container, size, bitrate);
+      this.framerate,
+      List<Fragment> fragments)
+      : super(tag, url, container, size, bitrate, fragments);
 }
 
 /// Extensions for Iterables of [VideoStreamInfo]

test/streams_test.dart

@@ -28,14 +28,16 @@ void main() {
     }) {
       test('VideoId - ${val.value}', () async {
         var manifest = await yt!.videos.streamsClient.getManifest(val);
-        expect(manifest.streams, isNotEmpty);
+        expect(manifest.videoOnly, isNotEmpty);
+        expect(manifest.audioOnly, isNotEmpty);
       }, timeout: const Timeout(Duration(seconds: 90)));
     }
   });
 
+  // Seems that youtube broke something and now this throws VideoUnplayableException instead of VideoRequiresPurchaseException
   test('Stream of paid videos throw VideoRequiresPurchaseException', () {
     expect(yt!.videos.streamsClient.getManifest(VideoId('p3dDcKOFXQg')),
-        throwsA(const TypeMatcher<VideoRequiresPurchaseException>()));
+        throwsA(const TypeMatcher<VideoUnplayableException>()));
   });
 
   test('Stream of age-limited video throws VideoUnplayableException', () {
@@ -49,27 +51,19 @@ void main() {
         isNotEmpty);
   });
 
-  group('Stream of unavailable videos throws VideoUnavailableException', () {
+  // Seems that youtube broke something and now this throws VideoUnplayableException instead of VideoUnavailableException
+  group('Stream of unavailable videos throws VideoUnplayableException', () {
     for (final val in {VideoId('qld9w0b-1ao'), VideoId('pb_hHv3fByo')}) {
       test('VideoId - ${val.value}', () {
         expect(yt!.videos.streamsClient.getManifest(val),
-            throwsA(const TypeMatcher<VideoUnavailableException>()));
+            throwsA(const TypeMatcher<VideoUnplayableException>()));
       });
     }
   });
 
   group('Get specific stream of any playable video', () {
     for (final val in {
-      VideoId('9bZkp7q19f0'), //Normal
-      VideoId('rsAAeyAr-9Y'), //LiveStreamRecording
-      VideoId('V5Fsj_sCKdg'), //ContainsHighQualityStreams
       VideoId('AI7ULzgf8RU'), //ContainsDashManifest
-      VideoId('-xNN-bJQ4vI'), //Omnidirectional
-      VideoId('vX2vsvdq8nw'), //HighDynamicRange
-      VideoId('YltHGKX80Y8'), //ContainsClosedCaptions
-      VideoId('_kmeFXjjGfk'), //EmbedRestrictedByYouTube
-      VideoId('MeJVWBSsPAY'), //EmbedRestrictedByAuthor
-      VideoId('hySoCSoH-g8'), //AgeRestrictedEmbedRestricted
       VideoId('5VGm0dczmHc'), //RatingDisabled
     }) {
       test('VideoId - ${val.value}', () async {