YTDLTT – MQTT-Controlled YouTube Downloader

ytdltt listens to the yt/dl MQTT topic and downloads YouTube videos or audio sequentially using yt-dlp.

The intended usecase is that this apps runs as systemd service. It watches a mqtt topic for a JSON string of paramters, downloads the content and uses (optionally) telegram/message mqtt topic to reply a wormhole code to the sender who will be able to use that code to download directly.

Features

• Audio or video download via URL prefix:
  • A---https://...
  • V---https://... → video (MP4)
• Optional: Magic Wormhole one-time download code via telegram

Workflow

It should work well with node-red and telegram:

• node-red watches telegram bot for incoming message (a youtuble url, maybe prefixed)
• check in node if sender is authorized
• optionally we may apply params, depending on senderID
• submits hash to yt/dl topic
• which is processed by ytdltt
• ytdltt sends wormhole code if applicable via message/telegram (which is further handled by node red)

Example node-red function node

Requirements

• yt-dlp and ffmpeg in $PATH
• MQTT broker
• Ruby with Trompie which enables seamless communication with mqtt broker
• Optional: magic-wormhole

Example MQTT Payload

• url: mandatory; prefix says if audio (A---) only or complete video (V---), prefix defaults to config[:variant]
• senderid: optional; could be used (is not) except for telegram reply
• mid: optional; telegrams conversation id,
• paramters: optional; expand yt-dlp argument list, also add different output path ( ["-P", "/tmp/foo"] )

{
  "url": "A---https://youtu.be/xyz123",
  "senderid": 4936578,
  "mid": 2834,
  "parameters": ["-P", "/home/media/mom/incoming"]
}

Nix systemd service definition, should be easy to adapt

systemd.services.ytdltt = {
  description = "Run ytdltt Ruby script";
  after = [ "network.target" ];
  wantedBy = [ "multi-user.target" ];

  serviceConfig = {
    Type = "simple";
    User = "mit";
    ExecStart = "${pkgs.ruby_3_2}/bin/ruby /etc/nixos/res/gems/ytdltt/bin/ytdltt";
    WorkingDirectory = "/etc/nixos/res/gems/ytdltt";

    Environment = [
      "PATH=${lib.makeBinPath [
        pkgs.ruby_3_2
        pkgs.ffmpeg
        pkgs.yt-dlp
        pkgs.magic-wormhole
      ]}:/etc/profiles/ruby-gems/bin"
      "YTDLTT_SLEEP=1"
    ];

    Restart = "on-failure";
    RestartSec = "60s";
    StartLimitBurst = 5;
  };
};