Bilibili Render Pdf

Goal

Same as youtube-render-pdf — produce a professional Chinese lecture note with cover image, key frames, and synthesis section.

Source Acquisition

Supplementary Material Discovery

Same as youtube-render-pdf — search for official slides AND official lecture notes before downloading video.

Additional Bilibili-specific notes:

• Many Chinese courses host slides on their own course websites or Gitee/GitHub repos
• Some courses have companion textbooks or reading lists — check the video description
• Google Slides/Docs strategy: try /export/pdf URL pattern; fall back to video frames if export fails
• If slides are found, use slide screenshots as the primary figure source and ensure they appear in the final PDF rather than relying on video frames alone
• Official lecture notes are especially valuable for Bilibili courses where subtitles may be auto-generated and formula accuracy is lower

Metadata Inspection

1. Inspect video metadata first (title, chapters, duration, thumbnail, subtitle availability)
2. Detect multi-part (分P) videos — list all parts and ask user which to process

Subtitle Acquisition (Three-Level Fallback)

Priority 1: CC subtitles

yt-dlp --write-subs --sub-langs "zh-Hans,zh-CN,zh,ai-zh" --convert-subs srt \
  --skip-download -o "%(title)s.%(ext)s" "<URL>"

Priority 2: Whisper speech-to-text

yt-dlp -x --audio-format wav -o "audio.%(ext)s" "<URL>"
whisper audio.wav --model medium --language zh --output_format srt --output_dir .

Priority 3: Visual-only mode — skip subtitles, rely on dense frame sampling.

Video and Cover Download

1. Download original cover image (highest-res thumbnail)
2. Probe formats, choose highest downloadable resolution (1080P+ needs cookies)
3. Keep all artifacts local

Delivery

• the final .tex file
• the downloaded cover image
• any extracted or generated figure assets
• the compiled PDF
• the Whisper-generated SRT subtitle file, if speech-to-text was used

Rules

• Follow ai-course-notes/CLAUDE.md conventions for LaTeX structure, boxes, and figures
• Always compile PDF twice (xelatex two passes) to resolve references
• Prefer CC subtitles; fall back to Whisper only when unavailable
• Skip non-teaching content (intros, sponsor segments, 一键三连, 关注投币)
• Use [H] float placement for all figures
• Set \noteauthors to "基于公开课程资料整理" or "基于 [Speaker Name] 授课内容整理" — never "XX & Codex" or similar
• Set \notedate to the video's publish date or course semester — never \today
• Always fill \videourl with the URL the user provided
• Keep \repourl{https://github.com/hqhq1025/ai-course-notes} unchanged from the template default
• Do NOT use TikZ for any visualization — it causes compilation timeouts. Use tables or pre-generated images instead

Asset

• assets/notes-template.tex: default LaTeX template to copy and fill