dasheng-video-talking-head

name	dasheng-video-talking-head
description	Use when producing or improving Dasheng真人出镜口播视频 from raw speaker footage, subtitles, rough cuts, B-roll, data charts, or HTML sticker overlays.

Dasheng Video Talking Head

Role

Build the真人出镜口播 production line. The speaker is the trust anchor; evidence screens, charts, documents, B-roll, subtitles, camera motion, and music carry the pace.

Required First Artifact

Create a director timeline before rendering:

python3 scripts/video_director_timeline.py \
  --srt <agent_proofread.srt> \
  --source-video <speaker.mp4> \
  --title "<title>" \
  --output <talking_head_timeline.json>

Use --captions-json instead of --srt when the rough-cut review page produced captions JSON.

Director Mechanism

Read docs/technical/video-editing-driving-mechanism.md and configs/video/video_editing_driver_rules.json before planning final shots.

Do not map every sentence to a sticker. Drive editing with:

evidence_need -> attention_debt -> trust_debt -> cognitive_load -> shot -> template/material -> transition -> audio

Default state machine:

speaker_anchor -> claim_closeup -> evidence_fullscreen -> broll_with_pip -> document_zoom/chart_card -> speaker_return

Production Rules

• Human audio/video is the master timeline.
• Subtitles must be Agent-proofread and semantically punctuated before final render.
• Use external html-video through dasheng-html-video-bridge only for evidence overlays, chart cards, title cards, or non-transparent visual layers; install on demand with scripts/ensure_video_external_deps.py.
• Every chart/table must come from article data or verified data collection. Fake placeholders are forbidden.
• Keep developer labels out of final video.
• Target vertical mobile output: 9:16, speaker crop safe, subtitle near the source-video bottom edge.
• If trust_debt exceeds 16 seconds, return to the speaker unless the current sequence is a dense evidence run.
• If a beat contains numbers, source documents, policies, companies, or market data, force an evidence shot before another decorative overlay.

Quality Targets

• Median visual segment: 2.5-4s.
• Evidence/B-roll ratio: 45%-65%.
• Speaker returns at least every 8-20s.
• Human voice target: about -16 LUFS, no mid-video silent gaps.
• Subtitle: 1-2 lines, about 24 Chinese chars per line, no overlap.

Output Contract

• talking_head_timeline.json
• agent_proofread.srt
• final_talking_head.mp4
• video_qc_report.json
• qa_contact_sheet.jpg