timeout fix

backend/config_parser.py

@@ -329,11 +329,13 @@ class TranscodeTools:
         if not os.path.exists(raw_file) or os.path.getsize(raw_file) == 0:
             try:
                 await nvr.login()
-                async with asyncio.timeout(10):
+                async def download_task():
                     self.logger.info(f"download new preview {preview_file}")
                     async with aiofiles.open(raw_file, "wb") as raw:
                         async for chunk in nvr.stream_file(file, preview_pre_bytes):
                             await raw.write(chunk)
+                await asyncio.wait_for(download_task(), 10)
+
             except asyncio.TimeoutError as te:
                 clear_from_storage()
                 self.logger.info(f"Cancel download file: {te}")