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"""
Adapted from:
https://github.com/genmoai/mochi/blob/main/demos/fine_tuner/trim_and_crop_videos.py
"""
from pathlib import Path
import shutil
import click
from moviepy.editor import VideoFileClip
from tqdm import tqdm
@click.command()
@click.argument("folder", type=click.Path(exists=True, dir_okay=True))
@click.argument("output_folder", type=click.Path(dir_okay=True))
@click.option("--num_frames", "-f", type=float, default=30, help="Number of frames")
@click.option("--resolution", "-r", type=str, default="480x848", help="Video resolution")
@click.option("--force_upsample", is_flag=True, help="Force upsample.")
def truncate_videos(folder, output_folder, num_frames, resolution, force_upsample):
"""Truncate all MP4 and MOV files in FOLDER to specified number of frames and resolution"""
input_path = Path(folder)
output_path = Path(output_folder)
output_path.mkdir(parents=True, exist_ok=True)
# Parse target resolution
target_height, target_width = map(int, resolution.split("x"))
# Calculate duration
duration = (num_frames / 30) + 0.09
# Find all MP4 and MOV files
video_files = (
list(input_path.rglob("*.mp4"))
+ list(input_path.rglob("*.MOV"))
+ list(input_path.rglob("*.mov"))
+ list(input_path.rglob("*.MP4"))
)
for file_path in tqdm(video_files):
try:
relative_path = file_path.relative_to(input_path)
output_file = output_path / relative_path.with_suffix(".mp4")
output_file.parent.mkdir(parents=True, exist_ok=True)
click.echo(f"Processing: {file_path}")
video = VideoFileClip(str(file_path))
# Skip if video is too short
if video.duration < duration:
click.echo(f"Skipping {file_path} as it is too short")
continue
# Skip if target resolution is larger than input
if target_width > video.w or target_height > video.h:
if force_upsample:
click.echo(
f"{file_path} as target resolution {resolution} is larger than input {video.w}x{video.h}. So, upsampling the video."
)
video = video.resize(width=target_width, height=target_height)
else:
click.echo(
f"Skipping {file_path} as target resolution {resolution} is larger than input {video.w}x{video.h}"
)
continue
# First truncate duration
truncated = video.subclip(0, duration)
# Calculate crop dimensions to maintain aspect ratio
target_ratio = target_width / target_height
current_ratio = truncated.w / truncated.h
if current_ratio > target_ratio:
# Video is wider than target ratio - crop width
new_width = int(truncated.h * target_ratio)
x1 = (truncated.w - new_width) // 2
final = truncated.crop(x1=x1, width=new_width).resize((target_width, target_height))
else:
# Video is taller than target ratio - crop height
new_height = int(truncated.w / target_ratio)
y1 = (truncated.h - new_height) // 2
final = truncated.crop(y1=y1, height=new_height).resize((target_width, target_height))
# Set output parameters for consistent MP4 encoding
output_params = {
"codec": "libx264",
"audio": False, # Disable audio
"preset": "medium", # Balance between speed and quality
"bitrate": "5000k", # Adjust as needed
}
# Set FPS to 30
final = final.set_fps(30)
# Check for a corresponding .txt file
txt_file_path = file_path.with_suffix(".txt")
if txt_file_path.exists():
output_txt_file = output_path / relative_path.with_suffix(".txt")
output_txt_file.parent.mkdir(parents=True, exist_ok=True)
shutil.copy(txt_file_path, output_txt_file)
click.echo(f"Copied {txt_file_path} to {output_txt_file}")
else:
# Print warning in bold yellow with a warning emoji
click.echo(
f"\033[1;33m⚠️ Warning: No caption found for {file_path}, using an empty caption. This may hurt fine-tuning quality.\033[0m"
)
output_txt_file = output_path / relative_path.with_suffix(".txt")
output_txt_file.parent.mkdir(parents=True, exist_ok=True)
output_txt_file.touch()
# Write the output file
final.write_videofile(str(output_file), **output_params)
# Clean up
video.close()
truncated.close()
final.close()
except Exception as e:
click.echo(f"\033[1;31m Error processing {file_path}: {str(e)}\033[0m", err=True)
raise
if __name__ == "__main__":
truncate_videos()
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