music-downloader/downloader/slice.py

from pathlib import Path
from .utils import to_hhmmss, system


async def slice_audio(src_path: Path, dst_path: Path, timecode: str):
    if not src_path.exists():
        raise FileNotFoundError

    if dst_path.exists():
        return dst_path

    start, end = map(int, timecode.split("/"))
    if start == -1:
        return src_path
    if start == 0 and end == -1:
        return src_path

    start = to_hhmmss(start)
    end = to_hhmmss(end)
    command = f'ffmpeg -ss {start} -to {end} -i "{src_path}" -qscale 0 "{dst_path}"'
    await system(command)
    return dst_path