diff --git a/tests/test_ffmpeg.py b/tests/test_ffmpeg.py
index 7cd93d6..54cbded 100644
--- a/tests/test_ffmpeg.py
+++ b/tests/test_ffmpeg.py
@@ -33,10 +33,10 @@ def before_all() -> None:
 	state_manager.init_item('temp_path', tempfile.gettempdir())
 	state_manager.init_item('temp_frame_format', 'png')
 	state_manager.init_item('output_audio_encoder', 'aac')
-	state_manager.init_item('output_audio_quality', 80)
+	state_manager.init_item('output_audio_quality', 100)
 	state_manager.init_item('output_audio_volume', 100)
 	state_manager.init_item('output_video_encoder', 'libx264')
-	state_manager.init_item('output_video_quality', 80)
+	state_manager.init_item('output_video_quality', 100)
 	state_manager.init_item('output_video_preset', 'ultrafast')
 
 
@@ -45,7 +45,6 @@ def before_each() -> None:
 	prepare_test_output_directory()
 
 
-@pytest.mark.stub
 def get_available_encoder_set() -> EncoderSet:
 	if os.getenv('CI'):
 		return\
@@ -146,9 +145,11 @@ def test_restore_audio() -> None:
 	output_audio_encoders = get_available_encoder_set().get('audio')
 
 	for target_path in target_paths:
+		create_temp_directory(target_path)
+
 		for output_audio_encoder in output_audio_encoders:
 			state_manager.init_item('output_audio_encoder', output_audio_encoder)
-			create_temp_directory(target_path)
+
 			copy_file(target_path, get_temp_file_path(target_path))
 
 			assert restore_audio(target_path, output_path, 0, 270) is True
@@ -173,9 +174,10 @@ def test_replace_audio() -> None:
 	output_audio_encoders = get_available_encoder_set().get('audio')
 
 	for target_path in target_paths:
+		create_temp_directory(target_path)
+
 		for output_audio_encoder in output_audio_encoders:
 			state_manager.init_item('output_audio_encoder', output_audio_encoder)
-			create_temp_directory(target_path)
 			copy_file(target_path, get_temp_file_path(target_path))
 
 			assert replace_audio(target_path, get_test_example_file('source.mp3'), output_path) is True