Bring back the warning displayed if video decoder initialization fails

app/src/main/java/com/limelight/Game.java

@@ -944,6 +944,16 @@ public class Game extends Activity implements SurfaceHolder.Callback,
             displayedFailureDialog = true;
             LimeLog.severe(stage+" failed: "+errorCode);
 
+            // If video initialization failed and the surface is still valid, display extra information for the user
+            if (stage.contains("video") && streamView.getHolder().getSurface().isValid()) {
+                runOnUiThread(new Runnable() {
+                    @Override
+                    public void run() {
+                        Toast.makeText(Game.this, "Video decoder failed to initialize. Your device may not support the selected resolution.", Toast.LENGTH_LONG).show();
+                    }
+                });
+            }
+
             Dialog.displayDialog(this, getResources().getString(R.string.conn_error_title),
                     getResources().getString(R.string.conn_error_msg)+" "+stage, true);
         }

app/src/main/java/com/limelight/binding/video/MediaCodecDecoderRenderer.java

@@ -440,13 +440,16 @@ public class MediaCodecDecoderRenderer extends VideoDecoderRenderer {
         startSpinnerThreads();
     }
 
+    // !!! May be called even if setup()/start() fails !!!
     public void prepareForStop() {
         // Let the decoding code know to ignore codec exceptions now
         stopping = true;
 
         // Halt the rendering thread
+        if (rendererThread != null) {
             rendererThread.interrupt();
         }
+    }
 
     @Override
     public void stop() {