TeroSubtitler

TeroSubtitler helps subtitlers, translators and video creators prepare captions for video content and streaming services. It combines automatic audio transcription with tools for editing text, adjusting timing and checking subtitle quality.

• Audio transcription: Generate subtitles with whisper.cpp or Faster-Whisper, then review and correct the text and timing.
• Timing and preview: Edit by frame or time alongside audiovisual playback and a timeline showing the audio waveform, subtitle positions and shot changes.
• Translation: Reuse previous translations through translation memory, compare subtitle sets and use the Google Translate API for automatic translation through an external service.
• Quality checks: Check spelling, flag common errors, validate subtitles against industry or custom profiles and automatically correct errors and rule violations.
• Conversion and export: Convert subtitle formats and frame rates, import and export Blu-ray SUP files, or produce videos with subtitles burned in.

The free, open-source desktop app runs on Windows, macOS and Linux under the Mozilla Public License 2.0. It uses mpv for playback and FFmpeg for audio and video processing. It can also open videos by URL through yt-dlp and supports video dubbing with ElevenLabs TTS. Multi-level undo and redo, plus automatic backups, help recover editing work.