from pathlib import Path

def get_presets_dir() -> Path:
    Path("./presets").mkdir(exist_ok=True)
    return Path("./presets")

def parse_yaml_config(config: dict) -> list:
    in_file = config.get("input_file")
    out_file = config.get("output_file")
    video = config.get("video", {})
    audio = config.get("audio", {})

    cmd = ["ffmpeg", "-y", "-i", in_file]

    if video:
        cmd += ["-c:v", video.get("codec", "libx264")]
        if "bitrate" in video:
            cmd += ["-b:v", video["bitrate"]]
        if "preset" in video:
            cmd += ["-preset", video["preset"]]

    if audio:
        cmd += ["-c:a", audio.get("codec", "aac")]
        if "bitrate" in audio:
            cmd += ["-b:a", audio["bitrate"]]
        if "channels" in audio:
            cmd += ["-ac", str(audio["channels"])]

    cmd += [out_file]
    return cmd