Rescale all mp4 files in --source-folder to 320 lines while keeping the source aspect ratio with ffmpeg and place rescaled videos in --destination-folder

downscale_videos.py

"""Rescale all mp4 files in --source-folder to 320 lines while keeping the source aspect ratio
   with ffmpeg and place rescaled videos in --destination-folder"""

import argparse
import subprocess
import logging

from datetime import datetime
from pathlib import Path

if __name__ == "__main__":
    logger = logging.getLogger(__name__)
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--source-folder",
        type=str,
        required=False,
        default="/Users/user/default/input/directory",
        help="The folder containing the video files to rescale.",
    )
    parser.add_argument(
        "--destination-folder",
        type=str,
        required=False,
        default="/Users/user/default/output/directory",
        help="The folder to save the dwonscaled videos in. Will be created if it doesn't exist yet.",
    )

    args = parser.parse_args()

    src = Path(args.source_folder)
    dst = Path(args.destination_folder)
    dst.mkdir(exist_ok=True)

    for file in src.glob("*.mp4"):
        newfile = dst / file.name
        try:
            subprocess.run(
                [
                    "/usr/local/bin/ffmpeg",
                    "-y",
                    "-i",
                    file.as_posix(),
                    "-vf",
                    "scale=320:-2,setsar=1:1",
                    "-c:v",
                    "libx264",
                    "-r",
                    "30",
                    "-hide_banner",
                    "-loglevel",
                    "error",
                    newfile.as_posix(),
                ]
            )
        except Exception as e:
            logger.error(f"Error while transcoding with ffmpeg {e}")