[YouTube] Support pronouns in subs count parsing of page channel headers

Author: AudricV

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

@@ -273,33 +273,24 @@ private long getSubscriberCountFromPageChannelHeader(@Nonnull final JsonObject h
                 .getObject(PAGE_HEADER_VIEW_MODEL)
                 .getObject(METADATA);
         if (metadataObject.has("contentMetadataViewModel")) {
-            final JsonArray metadataPart = metadataObject.getObject("contentMetadataViewModel")
-                    .getArray("metadataRows")
-                    .stream()
-                    .filter(JsonObject.class::isInstance)
-                    .map(JsonObject.class::cast)
-                    .map(metadataRow -> metadataRow.getArray("metadataParts"))
-                    /*
-                    Find metadata parts which have two elements: channel handle and subscriber
-                    count.
-
-                    On autogenerated music channels, the subscriber count is not shown with this
-                    header.
-
-                    Use the first metadata parts object found.
-                     */
-                    .filter(metadataParts -> metadataParts.size() == 2)
-                    .findFirst()
-                    .orElse(null);
-            if (metadataPart == null) {
-                // As the parsing of the metadata parts object needed to get the subscriber count
-                // is fragile, return UNKNOWN_SUBSCRIBER_COUNT when it cannot be got
+            final JsonArray metadataRows = metadataObject.getObject("contentMetadataViewModel")
+                    .getArray("metadataRows");
+
+            // Extract the latest metadata part, it contains in general two elements: the
+            // subscribers and videos counts
+            final JsonArray lastMetadataRowParts = metadataRows.getObject(
+                    Math.max(0, metadataRows.size() - 1))
+                    .getArray("metadataParts");
+
+            if (lastMetadataRowParts.size() < 2) {
+                // For autogenerated channels such as artist ones, subscribers count isn't returned,
+                // so the metadata part has a lower size
                 return UNKNOWN_SUBSCRIBER_COUNT;
             }
 
             try {
-                // The subscriber count is at the same position for all languages as of 02/03/2024
-                return Utils.mixedNumberWordToLong(metadataPart.getObject(0)
+                // The subscriber count is at the same position for all languages as of 07/07/2025
+                return Utils.mixedNumberWordToLong(lastMetadataRowParts.getObject(0)
                         .getObject("text")
                         .getString(CONTENT));
             } catch (final NumberFormatException e) {