Update roop/ui.py

roop/ui.py

@@ -1,285 +1,295 @@
-import os
-import sys
-import webbrowser
-import customtkinter as ctk
-from tkinterdnd2 import TkinterDnD, DND_ALL
-from typing import Any, Callable, Tuple, Optional
-import cv2
-from PIL import Image, ImageOps
-
-import roop.globals
-import roop.metadata
-from roop.face_analyser import get_one_face
-from roop.capturer import get_video_frame, get_video_frame_total
-from roop.face_reference import get_face_reference, set_face_reference, clear_face_reference
-from roop.predictor import predict_frame, clear_predictor
-from roop.processors.frame.core import get_frame_processors_modules
-from roop.utilities import is_image, is_video, resolve_relative_path
-
-ROOT = None
-ROOT_HEIGHT = 700
-ROOT_WIDTH = 600
-
-PREVIEW = None
-PREVIEW_MAX_HEIGHT = 700
-PREVIEW_MAX_WIDTH = 1200
-
-RECENT_DIRECTORY_SOURCE = None
-RECENT_DIRECTORY_TARGET = None
-RECENT_DIRECTORY_OUTPUT = None
-
-preview_label = None
-preview_slider = None
-source_label = None
-target_label = None
-status_label = None
-
-
-# todo: remove by native support -> https://github.com/TomSchimansky/CustomTkinter/issues/934
-class CTk(ctk.CTk, TkinterDnD.DnDWrapper):
-    def __init__(self, *args: Any, **kwargs: Any) -> None:
-        super().__init__(*args, **kwargs)
-        self.TkdndVersion = TkinterDnD._require(self)
-
-
-def init(start: Callable[[], None], destroy: Callable[[], None]) -> ctk.CTk:
-    global ROOT, PREVIEW
-
-    ROOT = create_root(start, destroy)
-    PREVIEW = create_preview(ROOT)
-
-    return ROOT
-
-
-def create_root(start: Callable[[], None], destroy: Callable[[], None]) -> ctk.CTk:
-    global source_label, target_label, status_label
-
-    ctk.deactivate_automatic_dpi_awareness()
-    ctk.set_appearance_mode('system')
-    ctk.set_default_color_theme(resolve_relative_path('ui.json'))
-
-    root = CTk()
-    root.minsize(ROOT_WIDTH, ROOT_HEIGHT)
-    root.title(f'{roop.metadata.name} {roop.metadata.version}')
-    root.configure()
-    root.protocol('WM_DELETE_WINDOW', lambda: destroy())
-
-    source_label = ctk.CTkLabel(root, text=None, fg_color=ctk.ThemeManager.theme.get('RoopDropArea').get('fg_color'))
-    source_label.place(relx=0.1, rely=0.1, relwidth=0.3, relheight=0.25)
-    source_label.drop_target_register(DND_ALL)
-    source_label.dnd_bind('<<Drop>>', lambda event: select_source_path(event.data))
-    if roop.globals.source_path:
-        select_source_path(roop.globals.source_path)
-
-    target_label = ctk.CTkLabel(root, text=None, fg_color=ctk.ThemeManager.theme.get('RoopDropArea').get('fg_color'))
-    target_label.place(relx=0.6, rely=0.1, relwidth=0.3, relheight=0.25)
-    target_label.drop_target_register(DND_ALL)
-    target_label.dnd_bind('<<Drop>>', lambda event: select_target_path(event.data))
-    if roop.globals.target_path:
-        select_target_path(roop.globals.target_path)
-
-    source_button = ctk.CTkButton(root, text='Select a face', cursor='hand2', command=lambda: select_source_path())
-    source_button.place(relx=0.1, rely=0.4, relwidth=0.3, relheight=0.1)
-
-    target_button = ctk.CTkButton(root, text='Select a target', cursor='hand2', command=lambda: select_target_path())
-    target_button.place(relx=0.6, rely=0.4, relwidth=0.3, relheight=0.1)
-
-    keep_fps_value = ctk.BooleanVar(value=roop.globals.keep_fps)
-    keep_fps_checkbox = ctk.CTkSwitch(root, text='Keep target fps', variable=keep_fps_value, cursor='hand2', command=lambda: setattr(roop.globals, 'keep_fps', not roop.globals.keep_fps))
-    keep_fps_checkbox.place(relx=0.1, rely=0.6)
-
-    keep_frames_value = ctk.BooleanVar(value=roop.globals.keep_frames)
-    keep_frames_switch = ctk.CTkSwitch(root, text='Keep temporary frames', variable=keep_frames_value, cursor='hand2', command=lambda: setattr(roop.globals, 'keep_frames', keep_frames_value.get()))
-    keep_frames_switch.place(relx=0.1, rely=0.65)
-
-    skip_audio_value = ctk.BooleanVar(value=roop.globals.skip_audio)
-    skip_audio_switch = ctk.CTkSwitch(root, text='Skip target audio', variable=skip_audio_value, cursor='hand2', command=lambda: setattr(roop.globals, 'skip_audio', skip_audio_value.get()))
-    skip_audio_switch.place(relx=0.6, rely=0.6)
-
-    many_faces_value = ctk.BooleanVar(value=roop.globals.many_faces)
-    many_faces_switch = ctk.CTkSwitch(root, text='Many faces', variable=many_faces_value, cursor='hand2', command=lambda: setattr(roop.globals, 'many_faces', many_faces_value.get()))
-    many_faces_switch.place(relx=0.6, rely=0.65)
-
-    start_button = ctk.CTkButton(root, text='Start', cursor='hand2', command=lambda: select_output_path(start))
-    start_button.place(relx=0.15, rely=0.75, relwidth=0.2, relheight=0.05)
-
-    stop_button = ctk.CTkButton(root, text='Destroy', cursor='hand2', command=lambda: destroy())
-    stop_button.place(relx=0.4, rely=0.75, relwidth=0.2, relheight=0.05)
-
-    preview_button = ctk.CTkButton(root, text='Preview', cursor='hand2', command=lambda: toggle_preview())
-    preview_button.place(relx=0.65, rely=0.75, relwidth=0.2, relheight=0.05)
-
-    status_label = ctk.CTkLabel(root, text=None, justify='center')
-    status_label.place(relx=0.1, rely=0.9, relwidth=0.8)
-
-    donate_label = ctk.CTkLabel(root, text='^_^ Donate to project ^_^', justify='center', cursor='hand2')
-    donate_label.place(relx=0.1, rely=0.95, relwidth=0.8)
-    donate_label.configure(text_color=ctk.ThemeManager.theme.get('RoopDonate').get('text_color'))
-    donate_label.bind('<Button>', lambda event: webbrowser.open('https://github.com/sponsors/s0md3v'))
-
-    return root
-
-
-def create_preview(parent: ctk.CTkToplevel) -> ctk.CTkToplevel:
-    global preview_label, preview_slider
-
-    preview = ctk.CTkToplevel(parent)
-    preview.withdraw()
-    preview.configure()
-    preview.protocol('WM_DELETE_WINDOW', lambda: toggle_preview())
-    preview.resizable(width=False, height=False)
-
-    preview_label = ctk.CTkLabel(preview, text=None)
-    preview_label.pack(fill='both', expand=True)
-
-    preview_slider = ctk.CTkSlider(preview, from_=0, to=0, command=lambda frame_value: update_preview(frame_value))
-
-    preview.bind('<Up>', lambda event: update_face_reference(1))
-    preview.bind('<Down>', lambda event: update_face_reference(-1))
-    return preview
-
-
-def update_status(text: str) -> None:
-    status_label.configure(text=text)
-    ROOT.update()
-
-
-def select_source_path(source_path: Optional[str] = None) -> None:
-    global RECENT_DIRECTORY_SOURCE
-
-    if PREVIEW:
-        PREVIEW.withdraw()
-    if source_path is None:
-        source_path = ctk.filedialog.askopenfilename(title='select an source image', initialdir=RECENT_DIRECTORY_SOURCE)
-    if is_image(source_path):
-        roop.globals.source_path = source_path
-        RECENT_DIRECTORY_SOURCE = os.path.dirname(roop.globals.source_path)
-        image = render_image_preview(roop.globals.source_path, (200, 200))
-        source_label.configure(image=image)
-    else:
-        roop.globals.source_path = None
-        source_label.configure(image=None)
-
-
-def select_target_path(target_path: Optional[str] = None) -> None:
-    global RECENT_DIRECTORY_TARGET
-
-    if PREVIEW:
-        PREVIEW.withdraw()
-    clear_face_reference()
-    if target_path is None:
-        target_path = ctk.filedialog.askopenfilename(title='select an target image or video', initialdir=RECENT_DIRECTORY_TARGET)
-    if is_image(target_path):
-        roop.globals.target_path = target_path
-        RECENT_DIRECTORY_TARGET = os.path.dirname(roop.globals.target_path)
-        image = render_image_preview(roop.globals.target_path, (200, 200))
-        target_label.configure(image=image)
-    elif is_video(target_path):
-        roop.globals.target_path = target_path
-        RECENT_DIRECTORY_TARGET = os.path.dirname(roop.globals.target_path)
-        video_frame = render_video_preview(target_path, (200, 200))
-        target_label.configure(image=video_frame)
-    else:
-        roop.globals.target_path = None
-        target_label.configure(image=None)
-
-
-def select_output_path(start: Callable[[], None]) -> None:
-    global RECENT_DIRECTORY_OUTPUT
-
-    if is_image(roop.globals.target_path):
-        output_path = ctk.filedialog.asksaveasfilename(title='save image output file', defaultextension='.png', initialfile='output.png', initialdir=RECENT_DIRECTORY_OUTPUT)
-    elif is_video(roop.globals.target_path):
-        output_path = ctk.filedialog.asksaveasfilename(title='save video output file', defaultextension='.mp4', initialfile='output.mp4', initialdir=RECENT_DIRECTORY_OUTPUT)
-    else:
-        output_path = None
-    if output_path:
-        roop.globals.output_path = output_path
-        RECENT_DIRECTORY_OUTPUT = os.path.dirname(roop.globals.output_path)
-        start()
-
-
-def render_image_preview(image_path: str, size: Tuple[int, int]) -> ctk.CTkImage:
-    image = Image.open(image_path)
-    if size:
-        image = ImageOps.fit(image, size, Image.LANCZOS)
-    return ctk.CTkImage(image, size=image.size)
-
-
-def render_video_preview(video_path: str, size: Tuple[int, int], frame_number: int = 0) -> ctk.CTkImage:
-    capture = cv2.VideoCapture(video_path)
-    if frame_number:
-        capture.set(cv2.CAP_PROP_POS_FRAMES, frame_number)
-    has_frame, frame = capture.read()
-    if has_frame:
-        image = Image.fromarray(cv2.cvtColor(frame, cv2.COLOR_BGR2RGB))
-        if size:
-            image = ImageOps.fit(image, size, Image.LANCZOS)
-        return ctk.CTkImage(image, size=image.size)
-    capture.release()
-    cv2.destroyAllWindows()
-
-
-def toggle_preview() -> None:
-    if PREVIEW.state() == 'normal':
-        PREVIEW.unbind('<Right>')
-        PREVIEW.unbind('<Left>')
-        PREVIEW.withdraw()
-        clear_predictor()
-    elif roop.globals.source_path and roop.globals.target_path:
-        init_preview()
-        update_preview(roop.globals.reference_frame_number)
-        PREVIEW.deiconify()
-
-
-def init_preview() -> None:
-    PREVIEW.title('Preview [ ↕ Reference face ]')
-    if is_image(roop.globals.target_path):
-        preview_slider.pack_forget()
-    if is_video(roop.globals.target_path):
-        video_frame_total = get_video_frame_total(roop.globals.target_path)
-        if video_frame_total > 0:
-            PREVIEW.title('Preview [ ↕ Reference face ] [ ↔ Frame number ]')
-            PREVIEW.bind('<Right>', lambda event: update_frame(int(video_frame_total / 20)))
-            PREVIEW.bind('<Left>', lambda event: update_frame(int(video_frame_total / -20)))
-        preview_slider.configure(to=video_frame_total)
-        preview_slider.pack(fill='x')
-        preview_slider.set(roop.globals.reference_frame_number)
-
-
-def update_preview(frame_number: int = 0) -> None:
-    if roop.globals.source_path and roop.globals.target_path:
-        temp_frame = get_video_frame(roop.globals.target_path, frame_number)
-        if predict_frame(temp_frame):
-            sys.exit()
-        source_face = get_one_face(cv2.imread(roop.globals.source_path))
-        if not get_face_reference():
-            reference_frame = get_video_frame(roop.globals.target_path, roop.globals.reference_frame_number)
-            reference_face = get_one_face(reference_frame, roop.globals.reference_face_position)
-            set_face_reference(reference_face)
-        else:
-            reference_face = get_face_reference()
-        for frame_processor in get_frame_processors_modules(roop.globals.frame_processors):
-            temp_frame = frame_processor.process_frame(
-                source_face,
-                reference_face,
-                temp_frame
-            )
-        image = Image.fromarray(cv2.cvtColor(temp_frame, cv2.COLOR_BGR2RGB))
-        image = ImageOps.contain(image, (PREVIEW_MAX_WIDTH, PREVIEW_MAX_HEIGHT), Image.LANCZOS)
-        image = ctk.CTkImage(image, size=image.size)
-        preview_label.configure(image=image)
-
-
-def update_face_reference(steps: int) -> None:
-    clear_face_reference()
-    reference_frame_number = int(preview_slider.get())
-    roop.globals.reference_face_position += steps
-    roop.globals.reference_frame_number = reference_frame_number
-    update_preview(reference_frame_number)
-
-
-def update_frame(steps: int) -> None:
-    frame_number = preview_slider.get() + steps
-    preview_slider.set(frame_number)
-    update_preview(preview_slider.get())
+import os
+import sys
+import webbrowser
+try:
+    import customtkinter as ctk
+    from tkinterdnd2 import TkinterDnD, DND_ALL
+except ImportError:
+    # Headless mode fallback
+    class MockTkinterDnD:
+        class DnDWrapper: pass
+        @staticmethod
+        def _require(self): pass
+    TkinterDnD = MockTkinterDnD
+    DND_ALL = 'DND_ALL'
+    ctk = None # Will error if accessed, which is correct for headless
+from typing import Any, Callable, Tuple, Optional
+import cv2
+from PIL import Image, ImageOps
+
+import roop.globals
+import roop.metadata
+from roop.face_analyser import get_one_face
+from roop.capturer import get_video_frame, get_video_frame_total
+from roop.face_reference import get_face_reference, set_face_reference, clear_face_reference
+from roop.predictor import predict_frame, clear_predictor
+from roop.processors.frame.core import get_frame_processors_modules
+from roop.utilities import is_image, is_video, resolve_relative_path
+
+ROOT = None
+ROOT_HEIGHT = 700
+ROOT_WIDTH = 600
+
+PREVIEW = None
+PREVIEW_MAX_HEIGHT = 700
+PREVIEW_MAX_WIDTH = 1200
+
+RECENT_DIRECTORY_SOURCE = None
+RECENT_DIRECTORY_TARGET = None
+RECENT_DIRECTORY_OUTPUT = None
+
+preview_label = None
+preview_slider = None
+source_label = None
+target_label = None
+status_label = None
+
+
+# todo: remove by native support -> https://github.com/TomSchimansky/CustomTkinter/issues/934
+class CTk(ctk.CTk, TkinterDnD.DnDWrapper):
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
+        super().__init__(*args, **kwargs)
+        self.TkdndVersion = TkinterDnD._require(self)
+
+
+def init(start: Callable[[], None], destroy: Callable[[], None]) -> ctk.CTk:
+    global ROOT, PREVIEW
+
+    ROOT = create_root(start, destroy)
+    PREVIEW = create_preview(ROOT)
+
+    return ROOT
+
+
+def create_root(start: Callable[[], None], destroy: Callable[[], None]) -> ctk.CTk:
+    global source_label, target_label, status_label
+
+    ctk.deactivate_automatic_dpi_awareness()
+    ctk.set_appearance_mode('system')
+    ctk.set_default_color_theme(resolve_relative_path('ui.json'))
+
+    root = CTk()
+    root.minsize(ROOT_WIDTH, ROOT_HEIGHT)
+    root.title(f'{roop.metadata.name} {roop.metadata.version}')
+    root.configure()
+    root.protocol('WM_DELETE_WINDOW', lambda: destroy())
+
+    source_label = ctk.CTkLabel(root, text=None, fg_color=ctk.ThemeManager.theme.get('RoopDropArea').get('fg_color'))
+    source_label.place(relx=0.1, rely=0.1, relwidth=0.3, relheight=0.25)
+    source_label.drop_target_register(DND_ALL)
+    source_label.dnd_bind('<<Drop>>', lambda event: select_source_path(event.data))
+    if roop.globals.source_path:
+        select_source_path(roop.globals.source_path)
+
+    target_label = ctk.CTkLabel(root, text=None, fg_color=ctk.ThemeManager.theme.get('RoopDropArea').get('fg_color'))
+    target_label.place(relx=0.6, rely=0.1, relwidth=0.3, relheight=0.25)
+    target_label.drop_target_register(DND_ALL)
+    target_label.dnd_bind('<<Drop>>', lambda event: select_target_path(event.data))
+    if roop.globals.target_path:
+        select_target_path(roop.globals.target_path)
+
+    source_button = ctk.CTkButton(root, text='Select a face', cursor='hand2', command=lambda: select_source_path())
+    source_button.place(relx=0.1, rely=0.4, relwidth=0.3, relheight=0.1)
+
+    target_button = ctk.CTkButton(root, text='Select a target', cursor='hand2', command=lambda: select_target_path())
+    target_button.place(relx=0.6, rely=0.4, relwidth=0.3, relheight=0.1)
+
+    keep_fps_value = ctk.BooleanVar(value=roop.globals.keep_fps)
+    keep_fps_checkbox = ctk.CTkSwitch(root, text='Keep target fps', variable=keep_fps_value, cursor='hand2', command=lambda: setattr(roop.globals, 'keep_fps', not roop.globals.keep_fps))
+    keep_fps_checkbox.place(relx=0.1, rely=0.6)
+
+    keep_frames_value = ctk.BooleanVar(value=roop.globals.keep_frames)
+    keep_frames_switch = ctk.CTkSwitch(root, text='Keep temporary frames', variable=keep_frames_value, cursor='hand2', command=lambda: setattr(roop.globals, 'keep_frames', keep_frames_value.get()))
+    keep_frames_switch.place(relx=0.1, rely=0.65)
+
+    skip_audio_value = ctk.BooleanVar(value=roop.globals.skip_audio)
+    skip_audio_switch = ctk.CTkSwitch(root, text='Skip target audio', variable=skip_audio_value, cursor='hand2', command=lambda: setattr(roop.globals, 'skip_audio', skip_audio_value.get()))
+    skip_audio_switch.place(relx=0.6, rely=0.6)
+
+    many_faces_value = ctk.BooleanVar(value=roop.globals.many_faces)
+    many_faces_switch = ctk.CTkSwitch(root, text='Many faces', variable=many_faces_value, cursor='hand2', command=lambda: setattr(roop.globals, 'many_faces', many_faces_value.get()))
+    many_faces_switch.place(relx=0.6, rely=0.65)
+
+    start_button = ctk.CTkButton(root, text='Start', cursor='hand2', command=lambda: select_output_path(start))
+    start_button.place(relx=0.15, rely=0.75, relwidth=0.2, relheight=0.05)
+
+    stop_button = ctk.CTkButton(root, text='Destroy', cursor='hand2', command=lambda: destroy())
+    stop_button.place(relx=0.4, rely=0.75, relwidth=0.2, relheight=0.05)
+
+    preview_button = ctk.CTkButton(root, text='Preview', cursor='hand2', command=lambda: toggle_preview())
+    preview_button.place(relx=0.65, rely=0.75, relwidth=0.2, relheight=0.05)
+
+    status_label = ctk.CTkLabel(root, text=None, justify='center')
+    status_label.place(relx=0.1, rely=0.9, relwidth=0.8)
+
+    donate_label = ctk.CTkLabel(root, text='^_^ Donate to project ^_^', justify='center', cursor='hand2')
+    donate_label.place(relx=0.1, rely=0.95, relwidth=0.8)
+    donate_label.configure(text_color=ctk.ThemeManager.theme.get('RoopDonate').get('text_color'))
+    donate_label.bind('<Button>', lambda event: webbrowser.open('https://github.com/sponsors/s0md3v'))
+
+    return root
+
+
+def create_preview(parent: ctk.CTkToplevel) -> ctk.CTkToplevel:
+    global preview_label, preview_slider
+
+    preview = ctk.CTkToplevel(parent)
+    preview.withdraw()
+    preview.configure()
+    preview.protocol('WM_DELETE_WINDOW', lambda: toggle_preview())
+    preview.resizable(width=False, height=False)
+
+    preview_label = ctk.CTkLabel(preview, text=None)
+    preview_label.pack(fill='both', expand=True)
+
+    preview_slider = ctk.CTkSlider(preview, from_=0, to=0, command=lambda frame_value: update_preview(frame_value))
+
+    preview.bind('<Up>', lambda event: update_face_reference(1))
+    preview.bind('<Down>', lambda event: update_face_reference(-1))
+    return preview
+
+
+def update_status(text: str) -> None:
+    status_label.configure(text=text)
+    ROOT.update()
+
+
+def select_source_path(source_path: Optional[str] = None) -> None:
+    global RECENT_DIRECTORY_SOURCE
+
+    if PREVIEW:
+        PREVIEW.withdraw()
+    if source_path is None:
+        source_path = ctk.filedialog.askopenfilename(title='select an source image', initialdir=RECENT_DIRECTORY_SOURCE)
+    if is_image(source_path):
+        roop.globals.source_path = source_path
+        RECENT_DIRECTORY_SOURCE = os.path.dirname(roop.globals.source_path)
+        image = render_image_preview(roop.globals.source_path, (200, 200))
+        source_label.configure(image=image)
+    else:
+        roop.globals.source_path = None
+        source_label.configure(image=None)
+
+
+def select_target_path(target_path: Optional[str] = None) -> None:
+    global RECENT_DIRECTORY_TARGET
+
+    if PREVIEW:
+        PREVIEW.withdraw()
+    clear_face_reference()
+    if target_path is None:
+        target_path = ctk.filedialog.askopenfilename(title='select an target image or video', initialdir=RECENT_DIRECTORY_TARGET)
+    if is_image(target_path):
+        roop.globals.target_path = target_path
+        RECENT_DIRECTORY_TARGET = os.path.dirname(roop.globals.target_path)
+        image = render_image_preview(roop.globals.target_path, (200, 200))
+        target_label.configure(image=image)
+    elif is_video(target_path):
+        roop.globals.target_path = target_path
+        RECENT_DIRECTORY_TARGET = os.path.dirname(roop.globals.target_path)
+        video_frame = render_video_preview(target_path, (200, 200))
+        target_label.configure(image=video_frame)
+    else:
+        roop.globals.target_path = None
+        target_label.configure(image=None)
+
+
+def select_output_path(start: Callable[[], None]) -> None:
+    global RECENT_DIRECTORY_OUTPUT
+
+    if is_image(roop.globals.target_path):
+        output_path = ctk.filedialog.asksaveasfilename(title='save image output file', defaultextension='.png', initialfile='output.png', initialdir=RECENT_DIRECTORY_OUTPUT)
+    elif is_video(roop.globals.target_path):
+        output_path = ctk.filedialog.asksaveasfilename(title='save video output file', defaultextension='.mp4', initialfile='output.mp4', initialdir=RECENT_DIRECTORY_OUTPUT)
+    else:
+        output_path = None
+    if output_path:
+        roop.globals.output_path = output_path
+        RECENT_DIRECTORY_OUTPUT = os.path.dirname(roop.globals.output_path)
+        start()
+
+
+def render_image_preview(image_path: str, size: Tuple[int, int]) -> ctk.CTkImage:
+    image = Image.open(image_path)
+    if size:
+        image = ImageOps.fit(image, size, Image.LANCZOS)
+    return ctk.CTkImage(image, size=image.size)
+
+
+def render_video_preview(video_path: str, size: Tuple[int, int], frame_number: int = 0) -> ctk.CTkImage:
+    capture = cv2.VideoCapture(video_path)
+    if frame_number:
+        capture.set(cv2.CAP_PROP_POS_FRAMES, frame_number)
+    has_frame, frame = capture.read()
+    if has_frame:
+        image = Image.fromarray(cv2.cvtColor(frame, cv2.COLOR_BGR2RGB))
+        if size:
+            image = ImageOps.fit(image, size, Image.LANCZOS)
+        return ctk.CTkImage(image, size=image.size)
+    capture.release()
+    cv2.destroyAllWindows()
+
+
+def toggle_preview() -> None:
+    if PREVIEW.state() == 'normal':
+        PREVIEW.unbind('<Right>')
+        PREVIEW.unbind('<Left>')
+        PREVIEW.withdraw()
+        clear_predictor()
+    elif roop.globals.source_path and roop.globals.target_path:
+        init_preview()
+        update_preview(roop.globals.reference_frame_number)
+        PREVIEW.deiconify()
+
+
+def init_preview() -> None:
+    PREVIEW.title('Preview [ ↕ Reference face ]')
+    if is_image(roop.globals.target_path):
+        preview_slider.pack_forget()
+    if is_video(roop.globals.target_path):
+        video_frame_total = get_video_frame_total(roop.globals.target_path)
+        if video_frame_total > 0:
+            PREVIEW.title('Preview [ ↕ Reference face ] [ ↔ Frame number ]')
+            PREVIEW.bind('<Right>', lambda event: update_frame(int(video_frame_total / 20)))
+            PREVIEW.bind('<Left>', lambda event: update_frame(int(video_frame_total / -20)))
+        preview_slider.configure(to=video_frame_total)
+        preview_slider.pack(fill='x')
+        preview_slider.set(roop.globals.reference_frame_number)
+
+
+def update_preview(frame_number: int = 0) -> None:
+    if roop.globals.source_path and roop.globals.target_path:
+        temp_frame = get_video_frame(roop.globals.target_path, frame_number)
+        if predict_frame(temp_frame):
+            sys.exit()
+        source_face = get_one_face(cv2.imread(roop.globals.source_path))
+        if not get_face_reference():
+            reference_frame = get_video_frame(roop.globals.target_path, roop.globals.reference_frame_number)
+            reference_face = get_one_face(reference_frame, roop.globals.reference_face_position)
+            set_face_reference(reference_face)
+        else:
+            reference_face = get_face_reference()
+        for frame_processor in get_frame_processors_modules(roop.globals.frame_processors):
+            temp_frame = frame_processor.process_frame(
+                source_face,
+                reference_face,
+                temp_frame
+            )
+        image = Image.fromarray(cv2.cvtColor(temp_frame, cv2.COLOR_BGR2RGB))
+        image = ImageOps.contain(image, (PREVIEW_MAX_WIDTH, PREVIEW_MAX_HEIGHT), Image.LANCZOS)
+        image = ctk.CTkImage(image, size=image.size)
+        preview_label.configure(image=image)
+
+
+def update_face_reference(steps: int) -> None:
+    clear_face_reference()
+    reference_frame_number = int(preview_slider.get())
+    roop.globals.reference_face_position += steps
+    roop.globals.reference_frame_number = reference_frame_number
+    update_preview(reference_frame_number)
+
+
+def update_frame(steps: int) -> None:
+    frame_number = preview_slider.get() + steps
+    preview_slider.set(frame_number)
+    update_preview(preview_slider.get())