使用 modal 运行 manim 代码

一 CPU 版本

manim_a_plus_b.py

from manim import *


class BinomialSquare(Scene):
  def construct(self):
    # Define constants
    a = 2
    b = 1
    square_side = a + b

    # Create the main square
    main_square = Square(side_length=square_side).set_color(BLUE)

    # Add labels (a+b) on sides
    label_a_top = Text("a", font_size=24).next_to(main_square, UP).shift(LEFT * b / 2)
    label_b_top = Text("b", font_size=24).next_to(main_square, UP).shift(RIGHT * a / 2)
    label_a_left = Text("a", font_size=24).next_to(main_square, LEFT).shift(UP * b / 2)
    label_b_left = Text("b", font_size=24).next_to(main_square, LEFT).shift(DOWN * a / 2)

    # Create dividing lines
    v_line = Line(main_square.get_corner(UP) + DOWN * a,
                  main_square.get_corner(DOWN) + UP * b)
    h_line = Line(main_square.get_corner(LEFT) + RIGHT * a,
                  main_square.get_corner(RIGHT) + LEFT * b)

    # Create smaller squares and rectangles
    a_square = Square(side_length=a).set_color(RED).move_to(main_square.get_corner(UP + LEFT))
    b_square = Square(side_length=b).set_color(YELLOW).move_to(main_square.get_corner(DOWN + RIGHT))
    ab_rect1 = Rectangle(width=a, height=b).set_color(GREEN).next_to(a_square, RIGHT)
    ab_rect2 = Rectangle(width=b, height=a).set_color(GREEN).next_to(a_square, DOWN)

    # Animation sequence
    self.play(Create(main_square))
    self.play(Write(label_a_top), Write(label_b_top),
              Write(label_a_left), Write(label_b_left))
    self.play(Create(v_line), Create(h_line))
    self.play(FadeIn(a_square), FadeIn(b_square),
              FadeIn(ab_rect1), FadeIn(ab_rect2))

    # Formula text
    formula = MathTex(r"(a+b)^2 = a^2 + 2ab + b^2").to_edge(DOWN)
    self.play(Write(formula))

    self.wait(2)


if __name__ == "__main__":
  # Basic configuration
  config.pixel_height = 1080  # Set resolution height
  config.pixel_width = 1920  # Set resolution width
  config.frame_rate = 30  # Set frame rate
  config.output_file = "CombinedScene"  # Specify output filename
  config.disable_caching = True  # Disable caching

  # Set output directory using placeholder for Java replacement
  config.media_dir = "#(output_path)"  # IMPORTANT: Use the placeholder

  # Create and render the scene

  sence = BinomialSquare()
  sence.render()

  print(f"Scene rendering finished. Output in: {config.media_dir}")

modal_run_with_manim.py

import modal

# 构建镜像：
# - apt_install 安装 TeX Live、FFmpeg、pkg-config、cairo 开发包以及 pango 开发包
# - pip_install 安装 Python 包（numpy、manim、manimpango、latex、moviepy、requests）
# - add_local_dir 将本地 "scripts" 目录挂载到容器的 /scripts 目录
image = (
  modal.Image.debian_slim()
  .apt_install("texlive-full", "ffmpeg", "pkg-config", "libcairo2-dev", "libpango1.0-dev")
  .pip_install("numpy", "manim", "manimpango", "latex", "moviepy", "requests")
  .add_local_dir("scripts", "/scripts")
)

app = modal.App("example-run-local-script", image=image)


@app.function()
def run_script():
  with open("/scripts/manim_a_plus_b.py", "r", encoding="utf-8") as f:
    script_content = f.read()
    print(script_content)
    exec(script_content, {'__name__': '__main__'})

  print("exec finished")

二 GPU 版本

import subprocess

import modal

image = (
  modal.Image.from_registry("nvidia/cuda:12.2.0-devel-ubuntu22.04", add_python="3.10")
  .env({"DEBIAN_FRONTEND": "noninteractive", "TZ": "Asia/Shanghai"})
  .apt_install("tzdata")
  .run_commands("ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo 'Asia/Shanghai' > /etc/timezone")
  .apt_install("build-essential", "ffmpeg", "ghostscript", "dvisvgm", "texlive-full")
  .apt_install("python3-dev", "pkg-config")
  .apt_install("libcairo2-dev", "libpango1.0-dev", "clang")
  .run_commands("pip install --upgrade pip setuptools wheel")
  .pip_install("numpy", "manim", "latex", "moviepy", "requests")
  .pip_install("manimpango")
  .add_local_dir("scripts", "/scripts")
)

app = modal.App("example-run-local-script", image=image)


@app.function(gpu="A10G")
def run_script():
  result = subprocess.run("ffmpeg -encoders | grep nven", shell=True, capture_output=True, text=True)
  print(result.stdout)

  with open("/scripts/manim_a_plus_b.py", "r", encoding="utf-8") as f:
    script_content = f.read()
    print(script_content)
    exec(script_content, {'__name__': '__main__'})
  print("exec finished")

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四、下载文件

五、常见问题：

Q：GPU 型号如何选择？

• T4：性价比最高，适合常规视频动画加速。
• A100 或 V100：更高性能，价格较贵，适合特别复杂的场景。

Q：如何调整分辨率？

修改 Manim 的-ql(480p)、-qm(720p)、-qh(1080p)参数即可。

例如 1080p:

manim -qh --renderer=opengl scene.py CombinedScene

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六、费用及效率

• 费用：按秒计费，用完即停，非常节省。
• 效率：GPU 渲染通常比本地 CPU 快数倍至数十倍，取决于复杂度。

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总结：

整合 Modal GPU 的方案能够快速有效地提高 Manim 渲染效率，是目前最直接、可靠且性价比高的 GPU 渲染方案之一，建议你直接尝试。