diff --git a/backend/src/routers/signvideo.py b/backend/src/routers/signvideo.py
index 3608c79..2b7f480 100644
--- a/backend/src/routers/signvideo.py
+++ b/backend/src/routers/signvideo.py
@@ -7,7 +7,8 @@ import random
 import string
 import subprocess
 
-from fastapi import APIRouter, Depends, FastAPI, File, UploadFile, status
+from fastapi import (APIRouter, BackgroundTasks, Depends, File, UploadFile,
+                     status)
 from fastapi.responses import FileResponse
 from fastapi_jwt_auth import AuthJWT
 from joblib import Memory
@@ -35,11 +36,20 @@ def extract_thumbnail(video_path):
     
 router = APIRouter(prefix="/signs/{sign_id}/video")
 
+def convert_video(video_filename):
+    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)
+
+    # delete the temporary file
+    os.remove(settings.DATA_PATH + "/" + video_filename + ".test")
+
+
 # endpoint to upload a file and save it in the data folder
 @router.post("/", status_code=status.HTTP_201_CREATED, response_model=SignVideoOut)
 async def sign_video(
     sign_id: int,
     video: UploadFile,
+    background_tasks: BackgroundTasks,
     session: AsyncSession = Depends(get_session),
     Authorize: AuthJWT = Depends(),
 ):
@@ -66,12 +76,8 @@ async def sign_video(
     with open(settings.DATA_PATH + "/" + video.filename + ".test", 'wb') as f:
         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]
-    process = await asyncio.create_subprocess_exec(*command)
-    await process.wait()
-
-    # delete the temporary file
-    os.remove(settings.DATA_PATH + "/" + video.filename + ".test")
+    # convert the video in the background
+    background_tasks.add_task(convert_video, video.filename)
 
     await sign_video.save(session)