AI Video Translator: Open-Source Dubbing and Subtitles That Work
An AI video translator adds subtitles or dubbing in any language. Open-source pipeline: Whisper transcribe, LLM translate, Coqui TTS voice.
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Video translation used to mean a studio budget. The open-source pipeline - transcribe, translate, re-voice - now produces watchable results for a few cents of electricity.
The Pipeline
Step 1: Whisper (106,813 stars) transcribes the original audio. Step 2: an LLM translates the transcript - DeepSeek-V3 (104,114 stars) is a strong open-weight translator, and translation quality beats word-for-word tools because it handles idioms. Step 3: generate subtitles directly, or dub with Coqui TTS (45,862 stars) for voice output. ffmpeg (63,025 stars) muxes everything back together.
Where It Struggles
Lip sync is the honest limit - dubbing voice will not match mouth movements; subtitles are the professional choice unless you accept that. Also keep the translated transcript checked by a human for product names and numbers - those are where models slip.
FAQ
Q: How long does translation take?
A: A 10-minute video: about 2 minutes transcription + 1 minute translation + muxing on a mid-range machine.
Q: Which languages are supported?
A: Whisper covers about 99 languages for transcription; translation works best between major languages (EN/ZH/ES/FR/DE/JA).
Written by our editorial team; tools listed here are tested or verified against public sources. Links point to official sites or GitHub repos for reference only — no paid placements.