import subprocess
from pathlib import Path


def run_cmd(cmd: list[str]) -> None:
    proc = subprocess.run(cmd, capture_output=True, text=True)
    if proc.returncode != 0:
        raise RuntimeError(f"Command failed: {' '.join(cmd)}\nSTDOUT: {proc.stdout}\nSTDERR: {proc.stderr}")


def frames_to_video(frames_pattern: str, fps: int, output_video_path: Path) -> None:
    output_video_path.parent.mkdir(parents=True, exist_ok=True)
    cmd = [
        "ffmpeg",
        "-y",
        "-framerate",
        str(fps),
        "-i",
        frames_pattern,
        "-pix_fmt",
        "yuv420p",
        str(output_video_path),
    ]
    run_cmd(cmd)


def extract_first_frame(video_path: Path, first_frame_path: Path) -> None:
    first_frame_path.parent.mkdir(parents=True, exist_ok=True)
    cmd = [
        "ffmpeg",
        "-y",
        "-i",
        str(video_path),
        "-vf",
        "select=eq(n\\,0)",
        "-vframes",
        "1",
        str(first_frame_path),
    ]
    run_cmd(cmd)