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@optima-chat/video-translate-tools

v1.0.8

Published

Path-B styled subtitle rendering + auto BGM ducking for HeyGen-translated videos. Pairs with `gen video-translate` CLI.

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Links

Git

Maintainers

veryveryproveryverypro

Keywords

video-translatesubtitleassffmpegheygen

Readme

@optima-chat/video-translate-tools

Path-B styled subtitle rendering + BGM ducking for HeyGen-translated videos. Pairs with the gen video-translate CLI from @optima-chat/optima-gen-cli.

gen video-translate --video-url $URL --lang $LANG -o ./out
curl <caption_url> -o ./out/caption.srt
video-translate render-ass --srt ./out/caption.srt --lang $TAG --out ./out/subs.ass
video-translate mux        --raw ./out/translate_*.mp4 --ass ./out/subs.ass [--bgm ./bgm.wav] -o ./final.mp4

Install (in optima-ai-shell Dockerfile)

RUN apt-get install -y fonts-noto-core && \
    npm install -g @optima-chat/video-translate-tools@latest && \
    cp -r $(video-translate fonts-dir)/. /usr/share/fonts/video-translate/ && \
    fc-cache -f

CLI Reference

render-ass

Parse SRT → ASS path-B styled subtitles.

| Flag | Required | Description | |---|---|---| | --srt <path> | ✅ | HeyGen SRT file (BOM auto-stripped) | | --lang <en\|ms\|vi\|th> | ✅ | Target lang. Determines font + max chars per line | | --out <path> | ✅ | Output ASS path | | --translations <path> | ⬜ | Save / read JSON intermediate. If file exists, used as-is; user can hand-edit to add **word** for pink-KW highlight |

mux

Burn ASS onto HeyGen mp4. Optional BGM ducking.

| Flag | Required | Description | |---|---|---| | --raw <path> | ✅ | HeyGen-output mp4 (has lip-synced voice) | | --ass <path> | ✅ | ASS subtitle file | | --out <path> | ✅ | Final mp4 | | --bgm <path> | ⬜ | If set, mix BGM under voice via asplit sidechain ducking | | --fonts-dir <path> | ⬜ | Override fonts dir (defaults to bundled packages/video-translate-tools/fonts/) |

fonts-dir

Print bundled fonts directory absolute path. Used by Dockerfile to register fonts.

Languages

| Tag | Font | Max chars/line | Source | |---|---|---|---| | en | Bangers | 32 | npm bundle (this pkg) | | ms | Bangers | 32 | npm bundle (this pkg) | | vi | Noto Sans | 30 | apt-get install fonts-noto-core | | th | Sarabun | 42 | npm bundle (this pkg) |

Thai uses 42 chars/line because Thai has no spaces between words — smartSplit would otherwise cut mid-word.

System deps

  • Node ≥ 20
  • ffmpeg with libass (apt-get install ffmpeg on Ubuntu)
  • For Vietnamese subs: fonts-noto-core apt pkg (standalone Noto Sans family)
  • For Thai subs: bundled in this npm package (Sarabun-Regular.ttf)

Note: fonts-noto-cjk does NOT provide standalone Noto Sans — it ships only Noto Sans CJK * families. Use fonts-noto-core.

Scope

v1 ships subtitle rendering + BGM-ducked muxing only. Voice override (custom voice selection from HeyGen library) is deferred to v2 — default flow uses HeyGen auto-clone of original speaker. See SPEC v3.1 §Scope.

License

MIT