python - Matplotlib 将动画保存为视频但获取空内容

Question

我试图制作一个继续旋转图像的动画，但输出视频文件有空内容(仅留下轴)，如何修复它？

import math

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.animation import FuncAnimation
import scipy.misc
from scipy import ndimage

my_image="img.png"
out_file="myvideo.mp4"

class UpdateDist:
    def __init__(self, ax):
        self.ax = ax
        self.img = mpimg.imread(my_image)
        self.ax.imshow(self.img)
        self.degree = 1


    def __call__(self, i):
        rotated_img = ndimage.rotate(img, self.degree*10)
        self.ax.imshow(rotated_img)
        self.degree += 1
        return self.ax,


plt.axis(False)
plt.grid(False)
fig, ax = plt.subplots()


ud = UpdateDist(ax)
anim = FuncAnimation(fig, ud, frames=100, interval=10, blit=True)
plt.show()
ani.save(out_file, fps=30, extra_args=['-vcodec', 'libx264'])

Answer 1

我对您的代码进行了一些编辑:

• 替换self.degree与 i :i每次迭代增加 1，不需要另一个计数器
• 感动ax.grid(False)和ax.axis(False) (并在 ax.clear() 内添加 __call__ )方法，以便在每个帧中使用它们
• 已删除 blit参数来自FuncAnimation
• 替换.mp4输出文件格式为.gif
• 已使用imagemagik如writer

请告诉我此代码是否实现了您的目标或者您是否需要任何进一步的修改。

完整代码

import matplotlib.pyplot as plt
from matplotlib.animation import FuncAnimation
from scipy import ndimage
import numpy as np


my_image='img.png'
out_file='myvideo.gif'


class UpdateDist:

    def __init__(self, ax, rotational_speed):
        self.ax = ax
        self.img = plt.imread(my_image)
        self.rotational_speed = rotational_speed

    def __call__(self, i):
        rotated_img = ndimage.rotate(self.img, self.rotational_speed*i, reshape=False)
        self.ax.clear()
        self.ax.grid(False)
        self.ax.axis(False)
        self.ax.imshow((rotated_img*255).astype(np.uint8))
        return self.ax,


fig, ax = plt.subplots()

ud = UpdateDist(ax = ax, rotational_speed = 1)
anim = FuncAnimation(fig, ud, frames = 91, interval = 1)
anim.save(filename = out_file, writer = 'pillow', fps = 30)

动画