diff --git a/backend/config_parser.py b/backend/config_parser.py
index f91a492..248ecd3 100644
--- a/backend/config_parser.py
+++ b/backend/config_parser.py
@@ -134,20 +134,21 @@ class TranscodeTools:
             return False
 
     async def h264toavi(self, source_file, delete_source_file = False):
-        exec_string = ""
+        exec_string = []
+        exec_cmd = ""
         if platform.system() == "Windows":
-            exec_string += ""
+            exec_cmd = f"{self.python_win32}"
         elif platform.system() == "Linux":
-            exec_string += "wine "
-        else:
+            exec_cmd = "wine"
+            exec_string.append(self.python_win32)
             raise Exception("Unknown platform to transcode")
 
-        exec_string += str(self.python_win32) + " "
-        exec_string += str(self.converter_script) + " "
-        exec_string += str(source_file)
-        print("execute", exec_string)
-        proc = await asyncio.create_subprocess_exec(exec_string)
-        await proc.wait()
+        exec_string.append(self.converter_script)
+        exec_string.append(source_file)
+
+        print("execute", exec_cmd, exec_string)
+        proc = await asyncio.create_subprocess_exec(exec_cmd, *exec_string)
+        await proc.communicate()
 
         if delete_source_file:
             os.remove(source_file)
@@ -157,10 +158,10 @@ class TranscodeTools:
             raise Exception("AVI not be created")
 
     async def avitomp4(self, source_file, delete_source_file = False):
-        exec_string = f"ffmpeg -y -i {source_file} {source_file}.mp4"
+        exec_string = ["-y", "-i", source_file, f"{source_file}.mp4"]
         print("execute", exec_string)
-        proc = await asyncio.create_subprocess_exec(exec_string)
-        await proc.wait()
+        proc = await asyncio.create_subprocess_exec("ffmpeg", *exec_string)
+        await proc.communicate()
 
         if delete_source_file:
             os.remove(source_file)
@@ -196,6 +197,16 @@ class TranscodeTools:
         self.statuses[status.b64].done = True
         self.statuses[status.b64].outSize = os.path.getsize(mp4_file)
 
+    async def transcode_test(self, raw_file):
+        avi_file = await self.h264toavi(raw_file)
+        mp4_file = await self.avitomp4(avi_file)
+
+    def h264toavi_test(self, raw_file):
+        loop = asyncio.get_event_loop()
+        tasks = [loop.create_task(self.transcode_test(raw_file))]
+        loop.run_until_complete(asyncio.wait(tasks))
+        loop.close()
+
 class Config:
     def __init__(self, config_name = "config.json", args = None) -> None:
         raw = load_config(config_name)
@@ -231,8 +242,11 @@ if __name__ == "__main__":
     import argparse
     parser = argparse.ArgumentParser()
     parser.add_argument("--no-hide-check", action="store_true")
+    parser.add_argument("--test-h264toavi", type=str)
     args = parser.parse_args()
-    
-    if args.no_hide_check:
-        Config(args = args)
+    config = Config(args = args)
+    if args.test_h264toavi:
+        config.transcode_tools.h264toavi_test(args.test_h264toavi)
+        sys.exit(0)
+
     sys.exit(0)
\ No newline at end of file