Add custom error for "Sign in to confirm ..."

Author: Stypox

extractor/src/main/java/org/schabi/newpipe/extractor/exceptions/YoutubeSignInConfirmNotBotException.java

@@ -0,0 +1,7 @@
+package org.schabi.newpipe.extractor.exceptions;
+
+public class YoutubeSignInConfirmNotBotException extends ParsingException {
+    public YoutubeSignInConfirmNotBotException(final String message) {
+        super(message);
+    }
+}

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

@@ -53,6 +53,7 @@
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.exceptions.PrivateContentException;
 import org.schabi.newpipe.extractor.exceptions.YoutubeMusicPremiumContentException;
+import org.schabi.newpipe.extractor.exceptions.YoutubeSignInConfirmNotBotException;
 import org.schabi.newpipe.extractor.linkhandler.LinkHandler;
 import org.schabi.newpipe.extractor.localization.ContentCountry;
 import org.schabi.newpipe.extractor.localization.DateWrapper;
@@ -901,7 +902,13 @@ private static void checkPlayabilityStatus(@Nonnull final JsonObject playability
             }
         }
 
-        throw new ContentNotAvailableException("Got error: \"" + reason + "\"");
+        // "Sign in to confirm that you're not a bot", "Watch on the latest version"
+        if (reason != null && (reason.contains("a bot") || reason.contains("latest"))) {
+            throw new YoutubeSignInConfirmNotBotException(
+                    "YouTube probably temporarily blocked this IP, got error: " + reason);
+        }
+
+        throw new ContentNotAvailableException("Got error " + status + ": \"" + reason + "\"");
     }
 
     private void fetchHtml5Client(@Nonnull final Localization localization,