wjs-burning-subtitles

Video + SRT → video with subtitles. Also the final-encode stage for the localization pipeline: takes a video, an optional dub track from /wjs-dubbing-video, and an optional SRT to burn, and produces the upload-ready MP4 in one ffmpeg pass. No cascade of decodes/re-encodes.

When to use

• User has an SRT and wants it always-visible on the video (burn-in for 微信视频号 / 抖音 / WeChat — players that won't honor embedded subtitle tracks).
• User wants a togglable subtitle track (soft-mux) for QuickTime / VLC / IINA / mobile players that support mov_text.
• Final composite after /wjs-dubbing-video: burn target-language subs + mix dub over original-as-bed in one encode.

When NOT to use

• No SRT yet → run /wjs-transcribing-audio then /wjs-translating-subtitles first.
• HTML/CSS captions (kinetic, per-word highlights, custom fonts) on a clip composed in HyperFrames → use /wjs-overlaying-video instead. Don't mix libass burn-in with HyperFrames captions on the same output.
• The "subtitles" are actually motion graphics (animated callouts, lower-thirds with logos, kinetic typography) → that's /wjs-overlaying-video, not this skill.

The 3 modes of render.py

scripts/render.py auto-detects mode from flags: