Show HN: Turn Your NAS into an AI Subtitle Machine (Open Source, Local) (subtitlesdog.com)

NAS-Subtitler is an open-source, plug‑and‑play subtitle service designed to run on your NAS so you can generate subtitles locally and automatically. You can deploy it in minutes with a single Docker command (subtitlesdog/nas-subtitler:1.0.0, mapping your media dir to /data and exposing port 3000). It offers local smart voice detection, automatic directory watching, retry logic, bilingual translation (example: English↔Mandarin), and outputs SRT/VTT/ASS for MP4/AVI/MKV/MOV. A browser UI (http://your-nas-ip:3000) lets you add an AI service key (OpenAI, Claude, or your own endpoint) so you can choose models and control spend; the project emphasizes processing on-device with minimal external upload to protect privacy. For the AI/ML community this matters because it bridges heavy‑duty speech/transcription workflows with on‑prem convenience and privacy — ideal for home theaters, educators, and orgs that need internal training captions without sending all media to cloud services. Technically, it combines local audio processing (voice activity detection, transcription pipeline) with optional remote LLMs for translation/cleanup, supports major media servers (Plex, Jellyfin, Emby), and produces industry-standard subtitle formats. Requirements are a NAS that supports Docker and an AI service key if you want cloud model assistance; otherwise core detection/transcription runs locally to minimize data exposure.