sed -i 's@^\(deb.*stable main\)$@#\1\ndeb https://mirrors.tuna.tsinghua.edu.cn/termux/termux-packages-24 stable main@' $PREFIX/etc/apt/sources.list
sed -i 's@^\(deb.*games stable\)$@#\1\ndeb https://mirrors.tuna.tsinghua.edu.cn/termux/game-packages-24 games stable@' $PREFIX/etc/apt/sources.list.d/game.list
sed -i 's@^\(deb.*science stable\)$@#\1\ndeb https://mirrors.tuna.tsinghua.edu.cn/termux/science-packages-24 science stable@' $PREFIX/etc/apt/sources.list.d/science.list
apt update && apt upgrade

• 给存储root权限

termux-setup-storage

• 安装python

pkg install python python2

• pip安装youtube-dl模块

pip install youtube-dl

• 使用youtube-dl模块下载任意视频

              这里以B站视频为例

youtube-dl https://www.bilibili.com/video/BV1Mq4y1V752

当然，你还可以指定文件格式输出

youtube-dl https://www.bilibili.com/video/BV1Mq4y1V752 -o luoxiang.mp4