diff --git a/backend/requirements.txt b/backend/requirements.txt
index 1788273..a5fc7ba 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -18,3 +18,6 @@ yapf==0.32.0
 mypy==0.961
 pylint==2.14.3
 pylint-quotes==0.2.3
+
+# Tests
+pytube==12.1.0
diff --git a/backend/src/crispy/utils/ffmpeg_utils.py b/backend/src/crispy/utils/ffmpeg_utils.py
index cbf686c..68b2426 100644
--- a/backend/src/crispy/utils/ffmpeg_utils.py
+++ b/backend/src/crispy/utils/ffmpeg_utils.py
@@ -1,4 +1,6 @@
 import os
+import random
+import string
 from typing import Optional, Any, List, Tuple
 
 import ffmpeg
@@ -93,4 +95,56 @@ def segment_video(video_path: str, save_path: str,
                     to=f"{end}")
             .overwrite_output()
             .run(quiet=False)
+        ) # yaPf: disable
+
+
+def find_available_path(video_path: str) -> str:
+    """
+    Find available path to store the scaled video temporarily.
+    """
+    dirname, basename = os.path.split(video_path)
+    h = str(hash(basename)) + ".mp4"
+    while (os.path.exists(os.path.join(dirname, h))):
+        h = random.choice(string.ascii_letters) + h
+
+    return os.path.join(dirname, h)
+
+
+def scale_video(video_path: str) -> None:
+    """
+    Scale (up or down) a video.
+    """
+    if os.path.exists(video_path):
+        save_path = find_available_path(video_path)
+        (
+            ffmpeg
+            .input(video_path)
+            .filter("scale", w=1920, h=1080)
+            .output(save_path, start_number=0)
+            .overwrite_output()
+            .run()
         ) # yapf: disable
+
+        os.remove(video_path)
+        os.rename(save_path, video_path)
+        # check if image has to be upscaled or downscaled ?
+    else:
+        raise FileNotFoundError(f"{video_path} not found")
+
+
+def create_new_path(video_path: str) -> str:
+    """
+    Create new path based on the original one.
+    """
+    drive, tail = os.path.split(video_path)
+    name, ext = os.path.splitext(tail)
+    nb = 1
+    cur_name = name + "_" + str(nb)
+    while os.path.exists(os.path.join(drive, cur_name + ext)):
+        nb = nb + 1
+        cur_name = name + "_" + str(nb)
+
+    tail = cur_name + ext
+    res = os.path.join(drive, cur_name + ext)
+
+    return res
diff --git a/backend/src/crispy/utils/test_ffmpeg_utils.py b/backend/src/crispy/utils/test_ffmpeg_utils.py
new file mode 100644
index 0000000..956c333
--- /dev/null
+++ b/backend/src/crispy/utils/test_ffmpeg_utils.py
@@ -0,0 +1,74 @@
+import os
+import cv2
+from pytube import YouTube
+from ffmpeg_utils import scale_video
+
+
+def test_basic() -> None:
+    os.mkdir("./test_mp4")
+    yt = YouTube("https://www.youtube.com/watch?v=6A-hTKYBkC4")
+    yt.streams.order_by("resolution").desc().first().download(
+        filename="./test_mp4/test_basic.mp4")
+    vid = cv2.VideoCapture("./test_mp4/test_basic.mp4")
+    width = vid.get(cv2.CAP_PROP_FRAME_WIDTH)
+    height = vid.get(cv2.CAP_PROP_FRAME_HEIGHT)
+
+    os.remove("./test_mp4/test_basic.mp4")
+    assert width == 1920 and height == 1080
+
+
+def test_upscale() -> None:
+    yt = YouTube("https://www.youtube.com/watch?v=6A-hTKYBkC4")
+    yt.streams.order_by("resolution").asc().first().download(
+        filename="./test_mp4/test_upscale.mp4")
+
+    scale_video("./test_mp4/test_upscale.mp4")
+    vid = cv2.VideoCapture("./test_mp4/test_upscale.mp4")
+    width = vid.get(cv2.CAP_PROP_FRAME_WIDTH)
+    height = vid.get(cv2.CAP_PROP_FRAME_HEIGHT)
+
+    os.remove("./test_mp4/test_upscale.mp4")
+    assert width == 1920 and height == 1080
+
+
+def test_downscale() -> None:
+    yt = YouTube("https://www.youtube.com/watch?v=wZI9is9Ix90")
+    yt.streams.order_by("resolution").desc().first().download(
+        filename="./test_mp4/test_downscale.mp4")
+
+    scale_video("./test_mp4/test_downscale.mp4")
+    vid = cv2.VideoCapture("./test_mp4/test_downscale.mp4")
+    width = vid.get(cv2.CAP_PROP_FRAME_WIDTH)
+    height = vid.get(cv2.CAP_PROP_FRAME_HEIGHT)
+
+    os.remove("./test_mp4/test_downscale.mp4")
+    os.rmdir("./test_mp4")
+    assert width == 1920 and height == 1080
+
+
+def abort(video_path: str) -> None:
+    top = os.path.split(video_path)[0]
+    print(top)
+    for root, dirs, files in os.walk(top, topdown=False):
+        for name in files:
+            os.remove(os.path.join(root, name))
+        for name in dirs:
+            os.rmdir(os.path.join(root, name))
+    os.rmdir(top)
+
+
+def split_check(video_path: str, frames: int) -> bool:
+    drive = os.path.split(video_path)[0]
+    for f in os.listdir():
+        path = os.path.join(drive, f)
+        if os.path.isfile(os.path.join(drive, f)):
+            vid = cv2.VideoCapture(path)
+            fps = vid.get(cv2.CAP_PROP_FPS)
+            frame_count = int(vid.get(cv2.CAP_PROP_FRAME_COUNT))
+            duration = frame_count // fps
+
+            print(duration)
+            if duration != frames:
+                abort(video_path)
+                return False
+    return True