This is an (unofficial) build of youtube-dl for ARM-based Android devices.
The distribution includes everything needed to run youtube-dl, that is: Python, its stdlib and youtube-dl itself.
The current build (19th Jan 2018) uses:
After unpacking, youtube-dl can be invoked using ./python3.6 youtube-dl.
You'll probably want to create a wrapper script like this:
Note: SSL/TLS certificate validation is enabled, so the SSL_CERT_FILE env variable should point to the trusted certificate store.
If you just want to have youtube-dl updated, you can replace the file with a fresh copy downloaded from here.
Otherwise just get on the mpv-android IRC channel or something...