preprocessing/preprocess_video.py

import os
import numpy as np

from helpers import detect_faces_in_video
from helpers import dense_sampling_from_extracted_frames
from helpers import remove_audio

def remove_audio_from_video(input_file):
    return remove_audio(input_file)


def extract_face_from_video(video_path, output_dir):
    os.makedirs(output_dir, exist_ok=True)
    cropped_faces = detect_faces_in_video(video_path, output_dir)
    return cropped_faces


def sample_frames_from_extracted_frames(output_dir_for_sampled_frames, output_dir_for_extracted_frames):
    os.makedirs(output_dir_for_sampled_frames, exist_ok=True)

    if not os.listdir(output_dir_for_extracted_frames):
        print("No extracted frames found in the folder.")
        raise ValueError("No extracted frames found in the folder.")
    
    sampled_frames = dense_sampling_from_extracted_frames(output_dir_for_extracted_frames, num_clips=6, frames_per_clip=5)
    
    for i, clip in enumerate(sampled_frames):
        clip_folder = os.path.join(output_dir_for_sampled_frames, f"clip_{i+1}")
        os.makedirs(clip_folder, exist_ok=True)
        
        for j, frame in enumerate(clip):
            np.save(os.path.join(clip_folder, f"frame_{j+1}.npy"), frame)

    return np.squeeze(sampled_frames)