A long-running Go program that watches a Youtube playlist for new videos, and downloads them using yt-dlp or other preferred tool.

Ideal for use with Plex, and comes with a mechanism for deleting watched videos from a Plex Library.

1. Add a video to YouTube playlist
2. Video appears in Plex library shortly

The Go Toolchain is required.

The following will install ytdlwatch to $GOPATH/bin:

go install github.com/raine/ytdlwatch@latest

To build for another platform, clone the repository and run go build like so:

env GOOS=target-OS GOARCH=target-architecture go build .

One method of triggering ytdlwatch to download videos is by watching a playlist for new videos on YouTube.

1. Create a project and an API key for accessing the Youtube API: https://console.cloud.google.com/apis/credentials

2. Enable access to YouTube API at https://console.developers.google.com/apis/api/youtube.googleapis.com/overview

3. Create a new playlist on Youtube. The playlist can be public or unlisted, but not private. In Playlist Settings, enable the setting "Add new videos to top of playlist" (screenshot). Needed so that the program only ever has to read the first page of playlist's items, and API quota does not have to be used for deleting videos.

   Could the personal "Watch later" playlist be used? Unfortunately not, since it's not available through the official API.

4. Run ytdlwatch with the environment variables listed below set up.

See also the example systemd service: ytdlwatch.service.example

The program can be made to listen for HTTP requests that include video URL to be downloaded.

1. Define the PORT environment variable
2. Send a POST request to path /download with video URL as the body.

curl -X POST http://localhost:8080/download -d'https://www.youtube.com/watch?v=dQw4w9WgXcQ'

One use case for ytdlwatch is to download videos into a Plex library. That part is doable by just creating a new library in Plex, and adding the directory at OUTPUT_PATH as media source. What maybe remains desired is a mechanism for automatically deleting watched videos. You can make ytdlwatch to delete watched videos periodically by configuring the Plex related environment variables below.

Plex can read Youtube metadata embedded to video files (--embed-metadata), so using the YouTube-Agent is not strictly necessary, especially if you don't care about video metadata, however, Plex reads metadata only from a mp4 container, so yt-dlp arguments (YOUTUBE_DL_ARGS) need to be adjusted accordingly to only produce mp4 containers.

So probably a more reliable and less-hassle way is to use the YouTube-Agent, although setting it up requires some work. Youtube-Agent's README is not the most helpful so small setup guide here:

1. Locate the plug-ins folder for your Plex server: https://support.plex.tv/articles/201106098-how-do-i-find-the-plug-ins-folder/
2. Clone the Youtube-Agent in that directory: git clone https://github.com/ZeroQI/YouTube-Agent.bundle
3. Restart plex media server.
4. In Plex web UI, configure Youtube API key for the Youtube-Agent.
5. In Plex web UI, configure your video library that you use ytdlwatch with to use Youtube-Agent as agent.

Note that video filenames produced by yt-dlp need to contain the video id. This is configured as default in ytdlwatch.

• LOG_LEVEL: Log level of the program. Defaults to info.
• PORT: The port http server will bind to.
• YOUTUBE_API_KEY: Youtube API key. Needed for accessing the given Youtube playlist. Create one here (and a new project, if necessary): https://console.cloud.google.com/apis/credentials required
• YOUTUBE_PLAYLIST_ID: An ID for the Youtube playlist that is monitored by the program. You can see this in browser's page URL when viewing a playlist on Youtube. A long string that begins with characters PL. required
• OUTPUT_PATH: A path to a directory where videos should be downloaded to. required
• YOUTUBE_DL_PATH: Path to executable that is used to download videos from Youtube. Defaults to yt-dlp, which is a fork of youtube-dl.
• YOUTUBE_DL_ARGS: Parameters passed to the executable configured above. This can be used to override the default parameters used by ytdlwatch. If set, OUTPUT_PATH has no effect, and --paths <output path> has to be manually included in the args, if desired.
• PLEX_API_TOKEN: Plex API Token. This official support article has details on how to obtain it: Finding an authentication token / X-Plex-Token
• PLEX_API_URL: URL to Plex server. This might be something like http://localhost:32400.
• PLEX_LIBRARY_KEY: Key to the Plex library where YouTube videos are added to. The program will delete watched videos from this library. You can find the key by opening a library with browser in Plex UI and checking page URL for a query parameter like source=7.

The project uses just as a command runner (or make alternative).

See just -l for recipes.