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Production pipeline for creating 3Blue1Brown-style animated videos using Manim Community Edition. The agent handles the full workflow: creative planning, Python code generation, rendering, scene stitching, audio muxing, and iterative refinement. Modes: concept explainers, equation derivations, algorithm visualizations, data stories, architecture diagrams, paper explainers, 3D visualizations. 9 reference files, setup verification script, README. All API references verified against ManimCommunity/manim source.
93 lines
2.4 KiB
Markdown
93 lines
2.4 KiB
Markdown
# Rendering Reference
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## Prerequisites
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```bash
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manim --version # Manim CE
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pdflatex --version # LaTeX
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ffmpeg -version # ffmpeg
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```
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## CLI Reference
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```bash
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manim -ql script.py Scene1 Scene2 # draft (480p 15fps)
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manim -qm script.py Scene1 # medium (720p 30fps)
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manim -qh script.py Scene1 # production (1080p 60fps)
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manim -ql --format=png -s script.py Scene1 # preview still (last frame)
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manim -ql --format=gif script.py Scene1 # GIF output
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```
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## Quality Presets
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| Flag | Resolution | FPS | Use case |
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|------|-----------|-----|----------|
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| `-ql` | 854x480 | 15 | Draft iteration (layout, timing) |
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| `-qm` | 1280x720 | 30 | Preview (use for text-heavy scenes) |
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| `-qh` | 1920x1080 | 60 | Production |
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**Text rendering quality:** `-ql` (480p15) produces noticeably poor text kerning and readability. For scenes with significant text, preview stills at `-qm` to catch issues invisible at 480p. Use `-ql` only for testing layout and animation timing.
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## Output Structure
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```
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media/videos/script/480p15/Scene1_Intro.mp4
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media/images/script/Scene1_Intro.png (from -s flag)
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```
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## Stitching with ffmpeg
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```bash
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cat > concat.txt << 'EOF'
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file 'media/videos/script/480p15/Scene1_Intro.mp4'
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file 'media/videos/script/480p15/Scene2_Core.mp4'
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EOF
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ffmpeg -y -f concat -safe 0 -i concat.txt -c copy final.mp4
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```
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## Add Voiceover
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```bash
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# Mux narration
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ffmpeg -y -i final.mp4 -i narration.mp3 -c:v copy -c:a aac -b:a 192k -shortest final_narrated.mp4
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# Concat per-scene audio first
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cat > audio_concat.txt << 'EOF'
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file 'audio/scene1.mp3'
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file 'audio/scene2.mp3'
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EOF
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ffmpeg -y -f concat -safe 0 -i audio_concat.txt -c copy full_narration.mp3
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```
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## Add Background Music
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```bash
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ffmpeg -y -i final.mp4 -i music.mp3 \
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-filter_complex "[1:a]volume=0.15[bg];[0:a][bg]amix=inputs=2:duration=shortest" \
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-c:v copy final_with_music.mp4
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```
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## GIF Export
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```bash
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ffmpeg -y -i scene.mp4 \
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-vf "fps=15,scale=640:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
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output.gif
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```
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## Aspect Ratios
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```bash
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manim -ql --resolution 1080,1920 script.py Scene # 9:16 vertical
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manim -ql --resolution 1080,1080 script.py Scene # 1:1 square
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```
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## Render Workflow
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1. Draft render all scenes at `-ql`
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2. Preview stills at key moments (`-s`)
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3. Fix and re-render only broken scenes
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4. Stitch with ffmpeg
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5. Review stitched output
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6. Production render at `-qh`
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7. Re-stitch + add audio
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