fixed autoplay bug

app/src/main/java/org/schabi/newpipe/PlayVideoActivity.java

@@ -130,7 +130,7 @@ public class PlayVideoActivity extends AppCompatActivity {
             public void onPrepared(MediaPlayer mp) {
                 progressBar.setVisibility(View.GONE);
                 videoView.seekTo(position);
-                if (position == 0) {
+                if (position <= 0) {
                     videoView.start();
                     showUi();
                 } else {

app/src/main/java/org/schabi/newpipe/crawler/VideoInfo.java

@@ -111,7 +111,7 @@ public class VideoInfo extends AbstractVideoInfo {
     public VideoPreviewInfo next_video = null;
     public List<VideoPreviewInfo> related_videos = null;
     //in seconds. some metadata is not passed using a VideoInfo object!
-    public int start_position = -1;
+    public int start_position = 0;
     //todo: public int service_id = -1;
 
     public VideoInfo() {}

app/src/main/java/org/schabi/newpipe/crawler/services/youtube/YoutubeStreamExtractor.java

@@ -463,7 +463,6 @@ public class YoutubeStreamExtractor implements StreamExtractor {
      * @return the offset (in seconds), or 0 if no timestamp is found.*/
     @Override
     public int getTimeStamp() throws ParsingException {
-        //todo: use video_info for getting timestamp
         String timeStamp;
         try {
             timeStamp = Parser.matchGroup1("((#|&|\\?)t=\\d{0,3}h?\\d{0,3}m?\\d{1,3}s?)", pageUrl);
@@ -505,7 +504,7 @@ public class YoutubeStreamExtractor implements StreamExtractor {
                 throw new ParsingException("Could not get timestamp.", e);
             }
         } else {
-            return -1;
+            return 0;
         }
     }