fix last

Dockerfile

@@ -9,7 +9,7 @@ ARG tuna=https://pypi.tuna.tsinghua.edu.cn/simple
 RUN pip install --no-cache-dir --upgrade pip -i $tuna && \
  pip install --no-cache-dir -r requires.txt -i $tuna && \
  sed -i "s@http://deb.debian.org@https://mirrors.tuna.tsinghua.edu.cn@g" /etc/apt/sources.list && \
- apt update && apt install -y opencv-python-headless --no-install-recommends && \
+ apt update && apt install -y ffmpeg libsm6 libxext6 --no-install-recommends && \
  apt-get clean && rm -rf /var/lib/apt/lists/*
 
 CMD ["gunicorn", "app:app", "-c", "gunicorn.conf"]