VideoCaptioner - AI video subtitling & burn-in

VideoCaptioner CLI

AI-powered video captioning: transcribe speech -> optimize subtitles -> translate -> burn into video with beautiful styles.

Features

Transcription to SRT/JSON using free engines (bijian/jianying) or whisper variants.
Subtitle optimization and LLM-assisted re-segmentation/translation.
Burn subtitles into video with ASS or rounded box styles; many presets and style overrides.
Full pipeline (process) or stepwise (transcribe, subtitle, synthesize).

Usage examples

Transcribe: videocaptioner transcribe video.mp4 --asr bijian -o output.srt
Translate and burn: videocaptioner process video.mp4 --asr bijian --translator bing --target-language en --subtitle-mode hard -o output.mp4
High-quality styled subtitles: use --style anime or --render-mode rounded.

Requirements & notes

ffmpeg required for video synthesis.
Some features (LLM optimization/translation) require an OPENAI_API_KEY.
Works for audio-only files as well.

When to use

Add or improve subtitles for videos, translate subtitles, or generate styled burned-in subtitles for publishing.

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