Create utils.py

utils.py

@@ -0,0 +1,51 @@
+from pathlib import Path
+from pytube import YouTube
+import numpy as np
+from decord import VideoReader
+import imageio
+
+
+def download_youtube_video(url: str):
+    yt = YouTube(url)
+
+    streams = yt.streams.filter(file_extension="mp4")
+    file_path = streams[0].download()
+    return file_path
+
+
+def sample_frames_from_video_file(
+    file_path: str, num_frames: int = 16, frame_sampling_rate=1
+):
+    videoreader = VideoReader(file_path)
+    videoreader.seek(0)
+
+    # sample frames
+    start_idx = 0
+    end_idx = num_frames * frame_sampling_rate - 1
+    indices = np.linspace(start_idx, end_idx, num=num_frames, dtype=np.int64)
+    frames = videoreader.get_batch(indices).asnumpy()
+
+    return frames
+
+
+def get_num_total_frames(file_path: str):
+    videoreader = VideoReader(file_path)
+    videoreader.seek(0)
+    return len(videoreader)
+
+
+def convert_frames_to_gif(frames, save_path: str = "frames.gif"):
+    converted_frames = frames.astype(np.uint8)
+    Path(save_path).parent.mkdir(parents=True, exist_ok=True)
+    imageio.mimsave(save_path, converted_frames, fps=8)
+    return save_path
+
+
+def create_gif_from_video_file(
+    file_path: str,
+    num_frames: int = 16,
+    frame_sampling_rate: int = 1,
+    save_path: str = "frames.gif",
+):
+    frames = sample_frames_from_video_file(file_path, num_frames, frame_sampling_rate)
+    return convert_frames_to_gif(frames, save_path)