OpenSpeaks Subtitler
Browser tool for subtitling Wikimedia Commons videos with automated silence detection.
OpenSpeaks Subtitler is a browser-based tool for adding subtitles to video files and publishing them to Wikimedia Commons. It loads media from a device or searches Wikimedia Commons, then uses automated silence detection to create draft subtitle chunks that can be edited on a timeline before export or upload.
The tool supports common video and audio formats, including MP4, MOV, MP3, and WAV, with an HTML5-based player for offline loading. Silence detection is configurable by threshold in decibels and minimum silence length in milliseconds. Editing includes a full timeline view, a zoomed-in view for the current subtitle context, an editable text overlay on the video player, and real-time updates during playback. Language selection uses the full ISO 639 list. Subtitles can be exported as SRT or VTT in UTF-8 encoding, or uploaded directly to Wikimedia Commons after logging in with MediaWiki credentials through OAuth.
The project is intended for contributors working with Wikimedia Commons media and multilingual knowledge. The pages describe the workflow and capabilities but do not state a free plan, trial, editions, or seat-based or usage-based packaging.
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