diff --git a/human/audio_inference_handler.py b/human/audio_inference_handler.py
index a363cbc..5552729 100644
--- a/human/audio_inference_handler.py
+++ b/human/audio_inference_handler.py
@@ -10,7 +10,7 @@ import numpy as np
 import torch
 
 from human_handler import AudioHandler
-from utils import load_model, mirror_index, get_device
+from utils import load_model, mirror_index, get_device, SyncQueue
 
 logger = logging.getLogger(__name__)
 current_file_path = os.path.dirname(os.path.abspath(__file__))
@@ -21,7 +21,7 @@ class AudioInferenceHandler(AudioHandler):
         super().__init__(context, handler)
 
         self._mal_queue = Queue()
-        self._audio_queue = Queue()
+        self._audio_queue = SyncQueue(context.render_batch)
 
         self._exit_event = Event()
         self._run_thread = Thread(target=self.__on_run)
@@ -126,5 +126,5 @@ class AudioInferenceHandler(AudioHandler):
         self._run_thread.join()
 
     def pause_talk(self):
-        self._audio_queue.queue.clear()
+        self._audio_queue.clear()
         self._mal_queue.queue.clear()
diff --git a/human/audio_mal_handler.py b/human/audio_mal_handler.py
index 5cad0e0..a7dc094 100644
--- a/human/audio_mal_handler.py
+++ b/human/audio_mal_handler.py
@@ -9,7 +9,7 @@ import numpy as np
 
 from human.message_type import MessageType
 from human_handler import AudioHandler
-from utils import melspectrogram
+from utils import melspectrogram, SyncQueue
 
 logger = logging.getLogger(__name__)
 
@@ -18,9 +18,7 @@ class AudioMalHandler(AudioHandler):
     def __init__(self, context, handler):
         super().__init__(context, handler)
 
-        self._queue = Queue()
-        self._wait = False
-        self._condition = Condition()
+        self._queue = SyncQueue(context.render_batch)
         self._exit_event = Event()
         self._thread = Thread(target=self._on_run)
         self._exit_event.set()
@@ -31,18 +29,7 @@ class AudioMalHandler(AudioHandler):
         logger.info("AudioMalHandler init")
 
     def on_message(self, message):
-        if message['msg_id'] == MessageType.Video_Render_Queue_Empty:
-            with self._condition:
-                if self._wait:
-                    self._wait = False
-                    self._condition.notify()
-                    print('AudioMalHandler notify')
-        elif message['msg_id'] == MessageType.Video_Render_Queue_Full:
-            if not self._wait:
-                self._wait = True
-                print('AudioMalHandler wait')
-        else:
-            super().on_message(message)
+        super().on_message(message)
 
     def on_handle(self, stream, index):
         self._queue.put(stream)
@@ -50,9 +37,6 @@ class AudioMalHandler(AudioHandler):
     def _on_run(self):
         logging.info('chunk2mal run')
         while self._exit_event.is_set():
-            with self._condition:
-                self._condition.wait_for(lambda: not self._wait)
-                print('AudioMalHandler run')
             self._run_step()
             time.sleep(0.02)
 
@@ -111,4 +95,4 @@ class AudioMalHandler(AudioHandler):
         logging.info('chunk2mal stop')
 
     def pause_talk(self):
-        self._queue.queue.clear()
+        self._queue.clear()
diff --git a/human/human_render.py b/human/human_render.py
index bb497db..ae9b211 100644
--- a/human/human_render.py
+++ b/human/human_render.py
@@ -1,13 +1,6 @@
 #encoding = utf8
-import copy
-import logging
-import queue
-import time
-from queue import Queue
-from threading import Thread, Event
 
-import cv2
-import numpy as np
+import logging
 
 from human.message_type import MessageType
 from human_handler import AudioHandler
diff --git a/render/base_render.py b/render/base_render.py
index cdb4c33..9e62ddc 100644
--- a/render/base_render.py
+++ b/render/base_render.py
@@ -5,6 +5,8 @@ from abc import ABC, abstractmethod
 from queue import Queue
 from threading import Event, Thread
 
+from utils import SyncQueue
+
 logger = logging.getLogger(__name__)
 
 
@@ -14,7 +16,7 @@ class BaseRender(ABC):
         self._context = context
         self._type = type_
         self._delay = delay
-        self._queue = Queue()
+        self._queue = SyncQueue(context.render_batch)
         self._exit_event = Event()
         self._thread = Thread(target=self._on_run)
         self._exit_event.set()
@@ -29,16 +31,16 @@ class BaseRender(ABC):
         logging.info(f'{self._type} render exit')
 
     def put(self, frame, ps):
-        self._queue.put_nowait((frame, ps))
+        self._queue.put((frame, ps))
 
     def size(self):
-        return self._queue.qsize()
+        return self._queue.size()
 
     def pause_talk(self):
-        self._queue.queue.clear()
+        self._queue.clear()
 
     def stop(self):
-        self._queue.queue.clear()
+        self._queue.clear()
         self._exit_event.clear()
         self._thread.join()
 
diff --git a/render/video_render.py b/render/video_render.py
index 0a27ff8..27158f8 100644
--- a/render/video_render.py
+++ b/render/video_render.py
@@ -32,7 +32,7 @@ class VideoRender(BaseRender):
                     self._diff_avg_count += 1
                 else:
                     if time_difference < -self._play_clock.audio_diff_threshold:
-                        sleep_time = abs(time_difference )
+                        sleep_time = abs(time_difference)
                         # print("Video frame waiting to catch up with audio", sleep_time)
                         if sleep_time <= 1.0:
                             time.sleep(sleep_time)
diff --git a/utils/sync_queue.py b/utils/sync_queue.py
index 8439b24..934ad09 100644
--- a/utils/sync_queue.py
+++ b/utils/sync_queue.py
@@ -30,3 +30,6 @@ class SyncQueue:
                 self._queue.get()
                 self._queue.task_done()
             self._condition.notify_all()
+
+    def size(self):
+        return self._queue.qsize()