diff --git a/plugins/ffmpeg.py b/plugins/ffmpeg.py
index 4aab044..f1e26a1 100644
--- a/plugins/ffmpeg.py
+++ b/plugins/ffmpeg.py
@@ -45,6 +45,7 @@ class Ffmpeg_controller:
         self.object_filename = None
         self.concat = True
         self.pause = False
+        self.autostart = False
         self.tasklist = []
 
         self.convert_task_thread = threading.Thread(target=self.convert_task_func, args=())
@@ -57,6 +58,7 @@ class Ffmpeg_controller:
         _create_floder('res/ffmpeg_tmp')
         _create_floder('res/ffmpeg_finished')
         _create_floder('res/ffmpeg_task')
+        _create_floder('res/ffmpeg_old')
         _create_floder('res/ffmpeg_complet')
 
         while True:
@@ -79,6 +81,7 @@ class Ffmpeg_controller:
                 dp.app = 'ffmpeg'
                 dp.body = b'start'
                 dp.head['filename'] = self.tasklist.pop(0)
+                self.autostart = dp.head['filename']
                 send_queue.put(dp)
 
             if dp.method == 'post' and dp.body == b'start': # config ffmpeg is server or client
@@ -160,6 +163,10 @@ class Ffmpeg_controller:
             pass
         os.remove('res/ffmpeg_finished/filelist.txt')
 
+        if self.autostart:
+            os.rename(self.autostart, self.autostart.replace('ffmpeg_task', 'ffmpeg_old'))
+            self.autostart = None
+
 
     def run_as_server(self):
         _padding_to_convert = os.listdir('res/ffmpeg_tmp')
@@ -183,6 +190,10 @@ class Ffmpeg_controller:
                 ndp.body = result.encode()
                 send_queue.put(ndp)
 
+            elif dp.method == 'post' and dp.body == b'reset':
+                padding_to_convert = already_in_convert
+                already_in_convert = []
+
             elif dp.method == 'post' and dp.body == b'stop':
                 break
 
diff --git a/plugins/net.py b/plugins/net.py
index 99761ad..7a2d2e2 100644
--- a/plugins/net.py
+++ b/plugins/net.py
@@ -356,6 +356,7 @@ class Connection:
         self.netowrk_controller = netowrk_controller
         self.id = None
         self.flag = None
+        self.f = None
         self.buff = b''
         self.padding_queue = queue.Queue()
         self.thread_send = None
@@ -414,6 +415,7 @@ class Connection:
                     if dp.method == 'file':
                         create_floder(dp.head['filename'])
                         create_floder('tmp/' + dp.head['filename'])
+                        self.f = open('tmp/' + dp.head['filename'], 'ab')
                     if dp.method == 'file' and os.path.exists(dp.head['filename']):
                         os.remove(dp.head['filename'])
                         
@@ -428,8 +430,7 @@ class Connection:
             if still_need > len(self.buff):
                 # writing tmp data
                 if dp.method == 'file':
-                    with open('tmp/' + dp.head['filename'], 'ab') as f:
-                        still_need -= f.write(self.buff)
+                    still_need -= self.f.write(self.buff)
                 else:
                     dp.body += self.buff
                     still_need -= len(self.buff)
@@ -437,8 +438,9 @@ class Connection:
 
             else: # download complete setuation
                 if dp.method == 'file':
-                    with open('tmp/' + dp.head['filename'], 'ab') as f:
-                        f.write(self.buff[:still_need])
+                    self.f.write(self.buff[:still_need])
+                    self.f.close()
+                    self.f = None
                 else:
                     dp.body = self.buff[:still_need]
                 self.buff = self.buff[still_need:]
@@ -452,6 +454,9 @@ class Connection:
 
         
         # below code are using to closed connection
+        if self.f:
+            self.f.close()
+            self.f = None
         self.conn.close()
         self.netowrk_controller.del_connection(self)