import zipfile
from pathlib import Path

zp = Path(r"C:\Users\Yvan\AppData\Local\Temp\短剧库-update.zip")
with zipfile.ZipFile(zp) as zf:
    for info in zf.infolist():
        name = info.filename
        if not info.flag_bits & 0x800:
            try:
                name = name.encode("cp437").decode("utf-8")
            except Exception:
                pass
        if name.endswith("internal/app/playback_stream.go"):
            body = zf.read(info).decode("utf-8", "replace")
            print("ultrafast in zip:", "ultrafast" in body)
            print("veryfast in zip:", "veryfast" in body)
            start = body.find("func playbackEncodingArgs")
            print(body[start:start + 420])
            break