Use tempdir for downloading

scdl/scdl.py

@@ -711,15 +711,21 @@ def download_hls(client: SoundCloud, track: BasicTrack, title: str, playlist_inf
     # Get the requests stream
     url = get_transcoding_m3u8(client, transcoding, **kwargs)
     filename_path = os.path.abspath(filename)
+    _, ext = os.path.splitext(filename)
 
+    with tempfile.TemporaryDirectory() as tmpdir:
+        temp_path = pathlib.Path(tmpdir).joinpath("scdl-download" + ext).absolute()
         p = subprocess.Popen(
-        ["ffmpeg", "-i", url, "-c", "copy", filename_path, "-loglevel", "error"],
+            ["ffmpeg", "-i", url, "-c", "copy", str(temp_path), "-loglevel", "error"],
             stdout=subprocess.PIPE,
-        stderr=subprocess.PIPE
+            stderr=subprocess.PIPE,
         )
         stdout, stderr = p.communicate()
         if stderr:
             logger.error(stderr.decode("utf-8"))
+        else:
+            shutil.move(temp_path, filename_path)
+
     return (filename, False)