Themearr is an automatic theme song downloader for Plex. It signs in with a Plex account, scans movie libraries, and places a theme.mp3 file into each movie folder that Plex uses for background music during browsing.
The tool presents the user's movie library as a poster grid. It auto-searches YouTube for each movie's theme using YoutubeExplode, scores candidates, and selects the best match. A one-click process then employs yt-dlp to fetch the audio and ffmpeg to transcode it as MP3 VBR Q0 before writing the file to the correct folder. Users can also paste any custom video URL as a source, with per-movie status tracking to show what has been completed.
Themearr chains Plex OAuth library sync, YouTube search and download, and audio transcoding into a four-stage pipeline that requires zero manual steps after the initial sign-in. It is built with .NET 9 as the backend, yt-dlp as the downloader, and ffmpeg as the encoder. The project is available on GitHub and includes an API.
Themearr sits in PulseGate's Entertainment & Media category. It focuses on adding theme music to Plex movie libraries without manual searching or downloading. Themearr is a consumer product aimed at plex users and home media enthusiasts. Themearr is free to use. The product ships for the web and API.
Themearr first shipped in 2026. The project is developed in the open on GitHub with 64 commits in the last 90 days. Among its 8 catalogued features are plex integration, youTube search, and one-click download. It exposes integrations via a public API.
Latest indexed changes and source events
[Release] Themearr – automatically add theme music to every movie in your Plex library verified by the PulseGate indexer
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