Jellyfin 12.0

Jellyfin has released version 12.0, marking a significant shift in its versioning scheme by dropping the leading "10" to better reflect major updates. This release focuses on performance enhancements stemming from database improvements initiated in version 10.11. Key features include optimized playlist and collection storage, leading to faster browsing and editing, especially for large libraries. The update also introduces unified support for alternate media versions across episodes and movies, ensuring consistent resume data. Furthermore, Jellyfin 12.0 significantly improves support for books and comics, integrating metadata reading, poster generation, and enhanced library layouts directly into the server, while deprecating the standalone Bookshelf plugin. Recommendation engines and search functionality are now extensible via plugins, allowing for custom data sources like ListenBrainz for music recommendations. Users must back up their data before upgrading, as database schema changes and data rewrites will occur on the first boot. Older third-party clients may experience compatibility issues.

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Jellyfin 12.0 introduces a major overhaul of its versioning strategy, moving from a "10.x" scheme to a simpler "12.0" to accurately represent significant releases. This change is crucial for users managing system deployments or parsing version strings. The release capitalizes on database architecture changes from 10.11, focusing on performance gains. Playlists and collections now store items individually, drastically improving load and edit times for extensive libraries. This database tuning extends to "Continue Watching" features and general library browsing, aiming to eliminate freezing issues during heavy database operations.

A significant functional expansion in 12.0 is the universal support for alternate media versions, now applicable to episodes as well as movies. This allows users to group different quality or cut versions of the same content and maintain synchronized playback progress across them. To properly implement this, a mandatory, extended library scan is required post-upgrade to rebuild version associations from existing files, which may initially cause some content to appear as newly added. This database migration process necessitates a full data backup before initiating the upgrade.

The 12.0 release marks a substantial enhancement of Jellyfin's capabilities for managing book and comic collections. Core functionalities previously handled by plugins, such as metadata extraction from OPF and ComicInfo files and poster generation for various formats, are now integrated into the server. New plugins offer enhanced metadata sourcing, and the web client features a redesigned book reading interface and improved library browsing. This integration aims to elevate the user experience for non-video media.

Jellyfin 12.0 also expands extensibility through its recommendation and search systems. Users can now select custom sources for "more like this" suggestions and recommendations on a per-library basis, with options like ListenBrainz for music. The search functionality is similarly opened to plugins, allowing third-party developers to integrate custom search providers. This move shifts Jellyfin's architecture towards a more modular and customizable platform, enabling users to tailor their media server's intelligence and data sourcing.