Cannot install ffmpeg with Termux Why do I get a   404  Not Found [IP: 104.18.36.234 80] after attempting to install ffmpeg?

 # apt-install ffmpeg
    Reading package lists...
    Building dependency tree...
    Reading state information...
    The following additional packages will be installed:
      libbz2 libopus libx264 xvidcore
    The following NEW packages will be installed:
      ffmpeg libbz2 libopus libx264 xvidcore
    0 upgraded, 5 newly installed, 0 to remove and 2 not upgraded.
    Need to get 5595 kB/6094 kB of archives.
    After this operation, 19.3 MB of additional disk space will be used.
    Do you want to continue? [Y/n] Err:1 http://termux.net stable/main arm ffmpeg arm 3.1.3-1
      404  Not Found [IP: 104.18.36.234 80]


The ip can be reached with ping and with a browser (link)

It is written Direct IP access not allowed is displayed on the page but that is normal since only apt from Termux may be allowed.
Termux requires frequent update: apt update