minor fixes

src/web/main.py

@@ -71,7 +71,9 @@ async def is_task_already_done_or_exist(redis: RedisClient, link: str):
 
     if len(tasks) > 0:
         task = tasks[0]
-        return task
+        if os.path.exists(os.path.join(os.getcwd(), os.pardir, os.pardir + "/downloads/" + task["result"])):
+            return task
+        await redis.del_task_from_task_done_queue(task)
 
 
 async def is_task_in_process(redis: RedisClient, link: str):
@@ -145,7 +147,7 @@ async def download_video(file_path):
         with open(base_download_dir + f'/{file_path}', mode="rb") as file_like:
             yield from file_like
 
-    return StreamingResponse(iterfile(), media_type="video/mp4")
+    return StreamingResponse(iterfile(), headers={'Content-Disposition': f'inline; filename="{file_path}"'}, media_type="video")
 
 
 @app.post('/check/', response_class=FileResponse, status_code=200)