Bazarr: Automatic Subtitle Management
Bazarr fills the one gap Sonarr and Radarr leave: subtitles.
What it does
It reads your libraries from Sonarr and Radarr, works out which files lack subtitles in your chosen languages, and searches subtitle providers for matches. When a release arrives without subtitles, Bazarr fetches them automatically, and it keeps looking periodically for items it could not satisfy immediately.
Sync correction is the underrated feature
Subtitles from a provider frequently match a different release and drift out of sync. Bazarr can compare the subtitle to the audio track and shift the timing to match, which converts a useless subtitle file into a usable one without manual adjustment in a text editor.
Providers
It supports a wide range of subtitle sources, some free and some requiring accounts. Configuring several improves hit rate substantially, particularly for non-English languages where any single provider’s coverage is patchy.
Scoring and quality
Provider results are scored on how well they match the specific release, and you can set a minimum score so Bazarr declines poor matches rather than downloading something mistimed. Raising that threshold is the fix when you keep getting subtitles for the wrong cut of a film.
Deployment
A container alongside the rest of the stack, with the same view of the media filesystem as Sonarr and Radarr so it can write subtitle files next to the video. Path consistency matters here exactly as it does elsewhere in the stack.
License
Bazarr is released under the GNU General Public License v3.0.