diff --git a/roop/core.py b/roop/core.py
index 191791b..ab8dd07 100755
--- a/roop/core.py
+++ b/roop/core.py
@@ -42,6 +42,7 @@ def parse_args() -> None:
     parser.add_argument('--keep-audio', help='maintain original audio', dest='keep_audio', action='store_true', default=True)
     parser.add_argument('--keep-frames', help='keep frames directory', dest='keep_frames', action='store_true', default=False)
     parser.add_argument('--many-faces', help='swap every face in the frame', dest='many_faces', action='store_true', default=False)
+    parser.add_argument('--video-quality', help='adjust video quality of output file', dest='video_quality', type=int, default=10)
     parser.add_argument('--max-memory', help='maximum amount of RAM in GB to be used', dest='max_memory', type=int)
     parser.add_argument('--cpu-cores', help='number of CPU cores to use', dest='cpu_cores', type=int, default=max(psutil.cpu_count() / 2, 1))
     parser.add_argument('--gpu-threads', help='number of threads to be use for the GPU', dest='gpu_threads', type=int, default=8)
@@ -57,6 +58,7 @@ def parse_args() -> None:
     roop.globals.keep_audio = args.keep_audio
     roop.globals.keep_frames = args.keep_frames
     roop.globals.many_faces = args.many_faces
+    roop.globals.video_quality = args.video_quality
 
     if args.cpu_cores:
         roop.globals.cpu_cores = int(args.cpu_cores)
diff --git a/roop/globals.py b/roop/globals.py
index 6680e63..f280566 100644
--- a/roop/globals.py
+++ b/roop/globals.py
@@ -7,6 +7,7 @@ keep_fps = None
 keep_audio = None
 keep_frames = None
 many_faces = None
+video_quality = None
 cpu_cores = None
 gpu_threads = None
 gpu_vendor = None
diff --git a/roop/ui.py b/roop/ui.py
index ca9e78a..c0d68c8 100644
--- a/roop/ui.py
+++ b/roop/ui.py
@@ -35,6 +35,7 @@ def create_root(start: Callable, destroy: Callable) -> tk.Tk:
     root.title('roop')
     root.configure(bg=PRIMARY_COLOR)
     root.option_add('*Font', ('Arial', 11))
+    root.protocol('WM_DELETE_WINDOW', lambda: destroy())
 
     source_label = tk.Label(root, bg=PRIMARY_COLOR)
     source_label.place(relx=0.1, rely=0.1, relwidth=0.3, relheight=0.25)
@@ -73,7 +74,7 @@ def create_root(start: Callable, destroy: Callable) -> tk.Tk:
     preview_button = create_secondary_button(root, 'Preview', lambda: toggle_preview())
     preview_button.place(relx=0.65, rely=0.75, relwidth=0.2, relheight=0.05)
 
-    status_label = tk.Label(root, justify='center', text='Status: UI under heavy development, more features will soon be (re)added', fg=ACCENT_COLOR, bg=PRIMARY_COLOR)
+    status_label = tk.Label(root, justify='center', text='Status: None', fg=ACCENT_COLOR, bg=PRIMARY_COLOR)
     status_label.place(relx=0.1, rely=0.9)
 
     return root
@@ -88,6 +89,7 @@ def create_preview(parent) -> tk.Toplevel:
     preview.configure(bg=PRIMARY_COLOR)
     preview.option_add('*Font', ('Arial', 11))
     preview.minsize(PREVIEW_WIDTH, PREVIEW_HEIGHT)
+    preview.protocol('WM_DELETE_WINDOW', lambda: toggle_preview())
 
     preview_label = tk.Label(preview, bg=PRIMARY_COLOR)
     preview_label.pack(fill='both', expand=True)
@@ -180,8 +182,8 @@ def select_target_path():
 
 
 def select_output_path(start):
-    output_path = filedialog.askopenfilename(title='Save to output file')
-    if os.path.isfile(output_path):
+    output_path = filedialog.asksaveasfilename(title='Save to output file', initialfile='output.mp4')
+    if output_path and os.path.isfile(output_path):
         roop.globals.output_path = output_path
         start()
 
@@ -207,7 +209,7 @@ def render_video_preview(video_path: str, dimensions: Tuple[int, int] = None, fr
     cv2.destroyAllWindows()
 
 
-def toggle_preview():
+def toggle_preview() -> None:
     if PREVIEW.state() == 'normal':
         PREVIEW.withdraw()
     else:
diff --git a/roop/utilities.py b/roop/utilities.py
index e05e323..27afbe6 100644
--- a/roop/utilities.py
+++ b/roop/utilities.py
@@ -35,7 +35,7 @@ def extract_frames(target_path: str) -> None:
 
 
 def create_video(target_path: str, fps: int) -> None:
-    run_ffmpeg(['-i', get_temp_directory_path(target_path) + os.sep + '%04d.png', '-framerate', str(fps), '-c:v', 'libx264', '-crf', '7', '-pix_fmt', 'yuv420p', '-y', get_temp_file_path(target_path)])
+    run_ffmpeg(['-i', get_temp_directory_path(target_path) + os.sep + '%04d.png', '-framerate', str(fps), '-c:v', 'libx264', '-crf', roop.globals.video_quality, '-pix_fmt', 'yuv420p', '-y', get_temp_file_path(target_path)])
 
 
 def restore_audio(target_path: str, output_path: str) -> None:
@@ -76,7 +76,7 @@ def has_image_extention(image_path: str) -> bool:
 
 
 def is_image(image_path: str) -> bool:
-    if os.path.isfile(image_path):
+    if image_path and os.path.isfile(image_path):
         try:
             image = Image.open(image_path)
             image.verify()
@@ -87,7 +87,7 @@ def is_image(image_path: str) -> bool:
 
 
 def is_video(video_path: str) -> bool:
-    if os.path.isfile(video_path):
+    if video_path and os.path.isfile(video_path):
         try:
             capture = cv2.VideoCapture(video_path)
             if capture.isOpened():