[YouTube] Don't generate DASH manifests for OTF streams when loading the content

The content loading when there are OTF streams is increased a lot by the fetch of the first segment of each stream and by the generation of the manifests.
The generation of these manifests needs now to be requested by clients (by using the createDashManifestFromOtfStreamingUrl method of the YoutubeDashManifestCreator class).

Also always use the streams from the desktopStreamingData JSON object first.

Author: AudricV

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamExtractor.java

@@ -1170,21 +1170,12 @@ private List<ContentAndItagItemAndIsUrl> getItags(final String streamingDataKey,
         final List<ContentAndItagItemAndIsUrl> contentsAndItagItems = new ArrayList<>();
         if (mobileStreamingData != null || desktopStreamingData != null) {
             final StreamType streamType = getStreamType();
-            if (streamType == StreamType.VIDEO_STREAM) {
-                // Use the mobileStreamingData JSON object first because there is no n param and no
-                // signatureCiphers in streaming URLs of the Android client
-                contentsAndItagItems.addAll(getStreamsFromStreamingDataKey(mobileStreamingData,
-                        streamingDataKey, itagTypeWanted, streamType));
-                contentsAndItagItems.addAll(getStreamsFromStreamingDataKey(desktopStreamingData,
-                        streamingDataKey, itagTypeWanted, streamType));
-            } else {
-                // Use the desktopStreamingData JSON object first because there are less redirects
-                // from the desktop endpoint
-                contentsAndItagItems.addAll(getStreamsFromStreamingDataKey(desktopStreamingData,
-                        streamingDataKey, itagTypeWanted, streamType));
-                contentsAndItagItems.addAll(getStreamsFromStreamingDataKey(mobileStreamingData,
-                        streamingDataKey, itagTypeWanted, streamType));
-            }
+            // Use the desktopStreamingData JSON object first because there are fewer redirects
+            // from the desktop endpoint for OTF and post live streams
+            contentsAndItagItems.addAll(getStreamsFromStreamingDataKey(desktopStreamingData,
+                    streamingDataKey, itagTypeWanted, streamType));
+            contentsAndItagItems.addAll(getStreamsFromStreamingDataKey(mobileStreamingData,
+                    streamingDataKey, itagTypeWanted, streamType));
         }
 
         return contentsAndItagItems;
@@ -1256,25 +1247,18 @@ private List<ContentAndItagItemAndIsUrl> getStreamsFromStreamingDataKey(
                             if (streamType == StreamType.VIDEO_STREAM) {
                                 if (formatData.getString("type", EMPTY_STRING)
                                         .equalsIgnoreCase("FORMAT_STREAM_TYPE_OTF")) {
-                                    try {
-                                        final String content =
-                                                createDashManifestFromOtfStreamingUrl(streamUrl,
-                                                        itagItem);
-                                        contentsAndItagItemsAndAreUrls.add(
-                                                new ContentAndItagItemAndIsUrl(content, itagItem,
-                                                        false));
-                                    } catch (final YoutubeDashManifestCreator
-                                            .YoutubeDashManifestCreationException ignored) {
-                                        // Something went wrong when generating the DASH manifest
-                                        // of the OTF stream, don't add this stream to the stream
-                                        // list
-                                    }
+                                    contentsAndItagItemsAndAreUrls.add(
+                                            new ContentAndItagItemAndIsUrl(streamUrl, itagItem,
+                                                    false));
                                 } else {
                                     contentsAndItagItemsAndAreUrls.add(
                                             new ContentAndItagItemAndIsUrl(streamUrl, itagItem,
                                                     true));
                                 }
                             } else if (streamType == StreamType.POST_LIVE_STREAM) {
+                                // Even if it increases the content loading, we need to generate
+                                // manifests of post live streams now because the
+                                // targetDurationSec value is required to create these manifests
                                 try {
                                     final String content =
                                             createDashManifestFromPostLiveStreamDvrStreamingUrl(