diff --git a/backend/src/routers/signvideo.py b/backend/src/routers/signvideo.py
index a9ce4f9..3608c79 100644
--- a/backend/src/routers/signvideo.py
+++ b/backend/src/routers/signvideo.py
@@ -1,3 +1,4 @@
+import asyncio
 import base64
 import datetime
 import io
@@ -66,7 +67,8 @@ async def sign_video(
         f.write(video.file.read())
 
     command = ['ffmpeg', '-y', '-i', settings.DATA_PATH + "/" + video.filename + ".test", '-c:v', 'libx264', '-c:a', 'aac', '-strict', '-2', '-b:a', '192k', '-c:a', 'aac', '-strict', '-2', '-b:a', '192k', settings.DATA_PATH + "/" + video.filename]
-    subprocess.run(command, check=True)
+    process = await asyncio.create_subprocess_exec(*command)
+    await process.wait()
 
     # delete the temporary file
     os.remove(settings.DATA_PATH + "/" + video.filename + ".test")