git clone mv-extractor and build image based on ubuntu 20.04

[HuanyuZang]

Hi @LukasBommes @sfmt-auto

I'm trying to build a docker image which can be used on ubuntu 20.04. I left another raised issue in https://github.com/LukasBommes/mv-extractor/issues/34 because this repo is rely on that one. Let me know if you don't wanna duplicated issues then i'll delete one of them.

I'm trying to build a docker image which is based on ubuntu 20.04. So, I changed part of the Dockerfile from

RUN cd $HOME && \
  git clone -b v0.0.0 https://github.com/LukasBommes/mv-extractor.git video_cap && \
  cd video_cap && \
  chmod +x install.sh && \
  ./install.sh

to

RUN cd $HOME && \
    git clone -b master https://github.com/LukasBommes/mv-extractor.git video_cap && \
    cd video_cap && \
    chmod +x install_ffmpeg.sh && \
    chmod +x install_opencv.sh && \
    ./install_ffmpeg.sh && \
    ./install_opencv.sh

cuz I wanna try if the docker image based on ubuntu 22.04 can be directly used on 20.04

but i got this error:

I'm wondering does this repo provide docker image based on ubuntu 20.04 or do you have any suggestions on why is this error?

Any comments will be helpful!

Thank you!