Lesson to knowledge-point clips

For teachers, tutors and coaches who record the same kind of session every week. You hand over a 60-minute lesson and get one short clip per teaching point instead of clips cut by length: “Today’s phrase: break the ice”, “Common mistake: I am agree → I agree”, “Word of the day: reluctant”. Each clip opens on a title card, keeps the teacher’s own explanation and examples, shows the key term on a card when it is first said, and carries captions in the lesson’s language with a translation under it. A recap clip strings every point together, and the lesson’s study notes come as Markdown and PDF.

Before you start

• The recording. A screen share, a camera recording, or both as two files. With two files Reelfold lines them up by their sound, so they do not have to start at the same moment.
• Your students. Names and faces of students should not end up in a public clip. Reelfold lists lines that name someone before keeping them; hide faces with a mask (below) or crop them out of the recording first.
• A translation model if you want bilingual captions (the default). The translation goes through your AI provider routing (task translate); without one, choose captions in the lesson’s language only.

In the Mac app

1. On Home, pick Lesson → knowledge-point clips (or describe it: “把这节课切成知识点，中英双语字幕，再出一份学习笔记”) and drop the recording, plus the camera file if you have one.
2. The plan names the recipe, the layout (with a camera: picture-in-picture), the caption mode and the platforms.
3. Approve the points. Reelfold transcribes once and lists the teaching points it found: kind, start and end, title, meaning, key terms. Edit, drop or keep them.
4. Rendering makes one clip per point for every platform shape (9:16 and 16:9 render separately, so nothing is cropped later), the recap, and the study notes.
5. Review and publish. Every file was checked before you see it (sound, loudness, first frame, captions, cover); a red item blocks the default approval.

With the Claude Code skill

The skill follows workflows/lesson-clips:

python -m vstudio.lesson plan --source lesson.mp4 --out work/points.json --count 6
python -m vstudio.lesson sync --source lesson.mp4 --camera cam.mov --out work/sync.json     # two files only
python -m vstudio.lesson render work/points.json --source lesson.mp4 --camera cam.mov --sync work/sync.json \
    --layout pip --platforms xiaohongshu:full,douyin --subtitles bilingual --recap --out out
python -m vstudio.lesson notes work/points.json --out out/notes.md --pdf out/notes.pdf --title "Small talk at work"

What a clip looks like

Part	What it shows
Title card (2.2 s)	The kind (“Today’s phrase · 今日短语”), the phrase or point, its meaning in the other language. Also the cover.
The explanation	The teacher’s own segment at the original speed, under a header that keeps the point on screen.
Key-term card	The term and its meaning, shown for a few seconds when it is first said.
Captions	The spoken line with the target phrase highlighted, the translation as a smaller second line.

Points come in four kinds: phrase, vocab, concept (a rule or a difference) and correction (a common mistake and its fix). Examples attach to the point they illustrate.

Layouts with a camera file

Layout	What it does
screen	The screen share only.
pip	Screen share with the camera as a small inset (default when a camera is given).
band	Vertical: screen band with the camera band under it. Horizontal: screen plus a camera column.
camera	The camera only.

If the two recordings cannot be lined up by sound, the run stops and asks for the offset instead of guessing.

Options worth knowing

Option	Default	What it does
Captions	bilingual	bilingual, mono (the lesson’s language only) or translated (the translation only).
Translate to	auto	The other of Chinese and English; or pick one.
Points	6	How many teaching points to cut, each 20 to 90 seconds.
Speed	1.0	Language lessons stay at the original speed.
Hide faces	off	sticker or blur on the whole picture, the camera tile or the screen. A face found on fewer than half the frames is flagged red.
Recap	on	One clip with a mini card and the teacher’s own line per point.

Example prompts

• “把这节课切成知识点，每条一个短语，中英双语字幕，再出一份学习笔记”
• “Cut this English lesson into today’s-phrase clips with Chinese subtitles only.”
• “Screen share and camera are two files: picture-in-picture, mask my face.”

Related

• Bilingual subtitles
• Interview to Q&A clips
• Course slicing (a course master and episodes instead of points)
• lesson-clips workflow reference