[client] fix bugs

ws_client.py

@@ -128,7 +128,7 @@ if __name__ == '__main__':
     
     # player paramters
     parser.add_argument('--speaker_device', type=int, default=speaker_device, help='Speaker device index')
-    parser.add_argument('--OUT_CHUNK', type=int, default=1024, help='Player chunk size')
+    parser.add_argument('--OUT_CHUNK', type=int, default=512, help='Player chunk size')
     parser.add_argument('--OUT_RATE', type=int, default=22050, help='Player audio rate')
     parser.add_argument('--OUT_FORMAT', type=int, default=16, help='Player audio format')
     parser.add_argument('--OUT_CHANNELS', type=int, default=1, help='Player audio channels')