diff --git a/aeneas/ffmpegwrapper.py b/aeneas/ffmpegwrapper.py
index a4f81cb..fd5f274 100644
--- a/aeneas/ffmpegwrapper.py
+++ b/aeneas/ffmpegwrapper.py
@@ -219,9 +219,8 @@ def convert(
         try:
             proc = subprocess.run(
                 arguments,
-                stdout=subprocess.PIPE,
+                capture_output=True,
                 stdin=subprocess.PIPE,
-                stderr=subprocess.PIPE,
                 check=True,
             )
         except OSError as exc:
@@ -233,7 +232,12 @@ def convert(
                 FFMPEGPathError,
             )
         except subprocess.CalledProcessError as e:
-            self.log_exc("ffmpeg returned non-zero status %r: %s" % (e.returncode, e.stderr.decode("utf-8", "replace")), critical=True, raise_type=OSError)
+            self.log_exc(
+                "ffmpeg returned non-zero status %r: %s"
+                % (e.returncode, e.stderr.decode("utf-8", "replace")),
+                critical=True,
+                raise_type=OSError,
+            )
 
         self.log("Call completed")
 
diff --git a/aeneas/tests/test_vad.py b/aeneas/tests/test_vad.py
index b69eff9..381f6bb 100644
--- a/aeneas/tests/test_vad.py
+++ b/aeneas/tests/test_vad.py
@@ -77,7 +77,11 @@ def perform(self, input_file_path, speech_length, nonspeech_length):
 
     def test_compute_vad(self):
         for f in self.FILES:
-            with self.subTest(path=f["path"], speech_length=f["speech_length"], nonspeech_length=f["nonspeech_length"]):
+            with self.subTest(
+                path=f["path"],
+                speech_length=f["speech_length"],
+                nonspeech_length=f["nonspeech_length"],
+            ):
                 self.perform(f["path"], f["speech_length"], f["nonspeech_length"])
 
     def test_not_existing(self):