--- title: Jellyfin 12 is a big deal, and it will probably break... description: Jellyfin 12.0 drops the old '10.x' version prefix and ships a major architectural overhaul: the backend now runs on .NET 10, breaking all third-party plugins... canonical: https://daily.dev/posts/jellyfin-12-is-a-big-deal-and-it-will-probably-break-your-setup-7kud9udkn twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Jellyfin 12 is a big deal, and it will probably break your setup | daily.dev og:description: Jellyfin 12.0 drops the old '10.x' version prefix and ships a major architectural overhaul: the backend now runs on .NET 10, breaking all third-party plugins... og:url: https://daily.dev/posts/jellyfin-12-is-a-big-deal-and-it-will-probably-break-your-setup-7kud9udkn og:image: https://api.daily.dev/og/posts/7kuD9UdKN.png og:image:alt: Jellyfin 12 is a big deal, and it will probably break your setup og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Jellyfin 12 is a big deal, and it will probably break your setup **[Trends](https://daily.dev/sources/trends)** · 2 min read · 10 upvotes · 2 comments ## Summary Jellyfin 12.0 drops the old '10.x' version prefix and ships a major architectural overhaul: the backend now runs on .NET 10, breaking all third-party plugins built for 10.11 until maintainers rebuild them. Upgrading requires being on 10.10.7 or 10.11.x, uninstalling plugins first, renaming duplicate usernames that differ only by case, and running a mandatory full library scan afterward. Improvements include a completed database rewrite (per-row storage for playlists/collections), FFmpeg 8.1 with Dolby Vision and AV1 direct streaming, native book/comic support replacing the Bookshelf plugin, Modern UI as default, and fixes for path traversal and XSS vulnerabilities. The legacy /emby/ and /mediabrowser/ API paths are removed, breaking outdated third-party clients, and a planned TLS/SSL removal was postponed. Separately, Streamyfin is highlighted as the most feature-rich Android client, with Findroid and Moonfin as solid simpler alternatives. ## Content Jellyfin just shipped version 12.0, and the version number itself is the first signal that something significant changed. The project dropped the legacy "10.x" prefix entirely to make major releases legible. This is a real architectural shift, not a point release with a flashy changelog. The backend moves to .NET 10, which means every third-party plugin built for 10.11 is now broken until its maintainer rebuilds it. The upgrade path has real teeth: you need to be on at least 10.10.7 or 10.11.x to upgrade directly, you must uninstall plugins *before* upgrading, and if you have duplicate usernames that differ only by capitalization, you need to rename them first or the migration fails. A mandatory full library scan is required after upgrading. None of this is optional. On the upside, the changes are genuinely good. The database rewrite that started in 10.11 is now complete — playlists and collections are stored per-row instead of as a single blob, which is a meaningful performance improvement for large libraries. FFmpeg bumps to 8.1, adding Dolby Vision compatibility and AV1 direct streaming. Native book and comic support lands in the server itself, deprecating the Bookshelf plugin. The Modern UI is now the default (Legacy is still selectable if you hate change). There are also security fixes for path traversal and XSS issues, which is the kind of thing you don't want to skip. The `/emby/` and `/mediabrowser/` API paths are gone, which will break older third-party clients that haven't updated. TLS/SSL removal was announced for 10.11 but got postponed, so that fight is still coming. Separately, if you're on Android and looking for a client worth using, Streamyfin has been getting attention as the most fully-featured option — Live TV, Jellyseerr integration, Chromecast, remote server management, and admin controls like bitrate caps and library hiding. An Android TV beta exists but is reportedly rough. Findroid and Moonfin are still solid for simpler use cases. Bottom line: Jellyfin 12 is worth upgrading to, but read the migration notes before you touch anything. ## Questions this post answers ### What do I need to do before upgrading to Jellyfin 12.0? Upgrade only from Jellyfin 10.10.7 or any 10.11.x version, since jumping from older releases is not supported. Uninstall all third-party plugins before upgrading, because they target the old .NET runtime and will not work until rebuilt for .NET 10. Rename any usernames that are duplicates differing only by capitalization, or the migration will fail. A full library scan runs automatically afterward. _daily.dev helps self-hosters catch breaking migration steps like this before an upgrade goes wrong._ ### Why are my Jellyfin plugins broken after upgrading to version 12? Jellyfin 12.0 moved its backend from the previous .NET runtime to .NET 10, which breaks binary compatibility with every plugin built for Jellyfin 10.11. Plugin maintainers need to rebuild against the new runtime before their plugins work again, so anyone upgrading should uninstall existing plugins first rather than let them fail silently. _Track ecosystem-breaking runtime upgrades like this on daily.dev before they take down your plugins._ ### What happened to the /emby/ and /mediabrowser/ API paths in Jellyfin 12? Jellyfin 12.0 removed the legacy /emby/ and /mediabrowser/ API endpoints entirely, which breaks any older third-party client app that still calls those paths instead of the current Jellyfin API. Client developers and users relying on outdated apps need to update before upgrading their server to avoid losing connectivity. _daily.dev keeps self-hosters and client developers ahead of API deprecations like this one._ ## Community take How the wider developer community reacted, aggregated from 2 discussions and 353 comments across lobsters, hackernews (as of 2026-09-08). **TL;DR:** The Jellyfin 12.0 release itself gets little direct discussion; most conversation is a broader Plex-vs-Jellyfin comparison covering remote access, music playback, client apps, and library management, with many long-time Plex lifetime-pass holders eyeing Jellyfin as a fallback. **Sentiment:** 40% positive · 45% mixed · 15% skeptical **The case for** - Several long-time Plex lifetime-pass users report switching to Jellyfin with no functional gaps and generally positive experiences. - Remote access via Tailscale is noted as easier and more reliable with Jellyfin than Plex for some users. - Jellyfin's Android/Android TV and newer LG/Tizen smart TV apps are praised as solid and reliable. - AI coding assistants (e.g. Claude) are widely credited with making *arr stack setup, maintenance, and troubleshooting dramatically easier. **The pushback** - Some found Jellyfin's metadata matching and library scanning less reliable, requiring manual fixes for thumbnails and episode grouping. - Jellyfin lacks an equivalent to Plexamp, a still-unmatched music player experience for some users. - Outside/remote access and easy sharing with non-technical friends and family remains much harder on Jellyfin than Plex. - Concerns were raised about Jellyfin sending passwords in cleartext at login, though others countered that HTTPS handles encryption. - Third-party client ecosystem (subtitle sizing, audiobook plugin, Bluray naming automation) still has rough edges compared to Plex. **By community** - lobsters (mixed): No comment content was provided, so no discussion signal is available beyond the points count. - hackernews (mixed): A long, wide-ranging thread mostly comparing Jellyfin to Plex, with many considering or having made the switch but citing remaining gaps in remote access, music, and metadata handling. **Hottest debate:** Whether Jellyfin's remote-access and client experience (especially for non-technical family members) is good enough to replace Plex, versus concerns that Plex's lifetime passes will eventually be devalued anyway. **Open questions** - Will Jellyfin ever offer an outside-access/sharing solution as simple as Plex's for non-technical users? - Is there a reliable automated way to identify and rename raw Bluray rip files without manual naming? - How will Plex's business model changes affect existing lifetime pass holders long-term? **Highlights** > I switched to jellyfin about 6 months ago and I can say it is definitely worse. I’m constantly fighting to fix thumbnails, fix episodes to be in the same show, force rescans to get it to even recognize a show that already exists. I never had any of these problems with plex. Plex also defaults to transcoding which fixes a lot of gaps with clients that don’t support certain codecs. I’m often running into issues where infuse can’t play DTS so I need to reencode before I can play the movies. Also in the process of ditching plex I switched to audiobookshelf for my audiobooks and I have to say it’s also crap. It’s constantly refusing to start playing, or pausing for a really long time before playing. All that being said I’m not switching back. It’s been a pain but it was worth it. > — [VladVladikoff on hackernews · 5 comments](https://news.ycombinator.com/item?id=49605102) > I left Plex for Jellyfin + Infuse a couple of years ago, and I'm not looking back. But the sore point right now is outside access, which Jellyfin really isn't made for. I set up Tailscale so I can connect Infuse to Jellyfin remotely. But that's not exactly as smooth as Plex. I can't give friends and family access, either, which was dead easy with Plex. In terms of the UX, Infuse isn't very good, but it does the job okay. The built-in subtitle fetcher is amazing; that stuff never worked for me with Plex. > — [atombender on hackernews · 3 comments](https://news.ycombinator.com/item?id=49607460) > Performance was also a big issue for me the last time I tried running Jellyfin on the same hardware as my Plex server. I’m happy to see that has been their focus. > — [al\_borland on hackernews](https://news.ycombinator.com/item?id=49605544) > ... as opposed to using salted hashing like in every tutorial since 1990s. > — [izacus on hackernews · 1 comments](https://news.ycombinator.com/item?id=49606830) > Or if like PlayOn, they’ll simply replace your legacy lifetime license software with their new version that no longer does the core functionality that has to be kept up to date — recording different providers — without upgrading to their new extra-special monthly cloud licensing that replaces your “lifetime” license you bought to support their fledgling business. One thing is almost certain, any software claimed to be “Lifetime” will become a lie if given time and one should assume “lifetime” in software almost never means more than 5-10 years before a new executive has a bright idea to generate more revenue. > — [therealpygon on hackernews](https://news.ycombinator.com/item?id=49609738) **Source threads** - [lobsters](https://lobste.rs/s/blba3b/jellyfin_12_0) · 32 points · 6 comments - [hackernews](https://news.ycombinator.com/item?id=49604861) · 337 points · 347 comments ## Community discussion Top comments from developers on daily.dev. **@aguy56** · 9 upvotes > Peak AI slop article. ## Similar posts on daily.dev - [Jellyfin 12 will break some home servers, and I'm okay with that](https://daily.dev/posts/jellyfin-12-will-break-some-home-servers-and-i-m-okay-with-that-zsuorhkn4) · XDA Developers · 2 upvotes · 0 comments - [State of the Fin 2026-01-06](https://daily.dev/posts/state-of-the-fin-2026-01-06-alffbnnmv) · Hacker News · 1 upvotes · 0 comments - [Jellyfin's desktop app was always the weak link, and version 12 rewrite is finally fixing it](https://daily.dev/posts/jellyfin-s-desktop-app-was-always-the-weak-link-and-version-12-rewrite-is-finally-fixing-it-tuqgiebcj) · XDA Developers · 0 upvotes · 0 comments - [Self-Host Weekly \(11 September 2026\)](https://daily.dev/posts/self-host-weekly-11-september-2026--gdwy2c7wq) · selfh.st · 2 upvotes · 0 comments - [Jellyfin's latest preview release finally convinced me to stop using separate media apps](https://daily.dev/posts/jellyfin-s-latest-preview-release-finally-convinced-me-to-stop-using-separate-media-apps-i2nlacly2) · XDA Developers · 0 upvotes · 0 comments --- Tags: [#open-source](https://daily.dev/tags/open-source), [#.net](https://daily.dev/tags/.net), [#self-hosting](https://daily.dev/tags/self-hosting), [#jellyfin](https://daily.dev/tags/jellyfin) [View this post on daily.dev](https://daily.dev/posts/jellyfin-12-is-a-big-deal-and-it-will-probably-break-your-setup-7kud9udkn) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Jellyfin 12 is a big deal, and it will probably break your setup","url":"https://daily.dev/posts/jellyfin-12-is-a-big-deal-and-it-will-probably-break-your-setup-7kud9udkn","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/jellyfin-12-is-a-big-deal-and-it-will-probably-break-your-setup-7kud9udkn"},"datePublished":"2026-09-08T14:19:43.183Z","dateModified":"2026-09-08T14:20:27.753Z","description":"Jellyfin 12.0 drops the old '10.x' version prefix and ships a major architectural overhaul: the backend now runs on .NET 10, breaking all third-party plugins...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/5fbad780b2590dffe2b967b58fee5967?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/5fbad780b2590dffe2b967b58fee5967?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Trends","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Trends","logo":"https://media.daily.dev/image/upload/s--ZfSp3asX--/f_auto,q_auto/v1780996004/logos/trends?_a=BAMAMiWQ0","url":"https://daily.dev/sources/trends"},"commentCount":2,"discussionUrl":"https://daily.dev/posts/jellyfin-12-is-a-big-deal-and-it-will-probably-break-your-setup-7kud9udkn","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":10},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":2}],"keywords":"open-source,.net,self-hosting,jellyfin","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Trends","item":"https://daily.dev/sources/trends"},{"@type":"ListItem","position":3,"name":"Jellyfin 12 is a big deal, and it will probably break your setup"}]} {"@context":"https://schema.org","@type":"WebPage","@id":"https://daily.dev/posts/jellyfin-12-is-a-big-deal-and-it-will-probably-break-your-setup-7kud9udkn","comment":[{"@type":"Comment","text":"Peak AI slop article.","datePublished":"2026-09-09T07:03:38.063Z","url":"https://daily.dev/posts/7kuD9UdKN#c-UB0KPZOQp","author":{"@type":"Person","name":"AGuy","url":"https://daily.dev/aguy56","image":"https://media.daily.dev/image/upload/s--_RcUwA8N--/f_auto/v1788937484/avatars/avatar_pKxiouz7jhVMaVDk4NHpk?_a=BAMAMicg0"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":9}}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/jellyfin-12-is-a-big-deal-and-it-will-probably-break-your-setup-7kud9udkn#faq","mainEntity":[{"@type":"Question","name":"What do I need to do before upgrading to Jellyfin 12.0?","acceptedAnswer":{"@type":"Answer","text":"Upgrade only from Jellyfin 10.10.7 or any 10.11.x version, since jumping from older releases is not supported. 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